Lens driving apparatus, and camera module and optical device comprising same

ABSTRACT

An embodiment includes: a housing including an upper surface, a lower surface, an inner surface, and an outer surface located at the side opposite to the inner surface; a bobbin accommodated in the housing; a first coil disposed at an outer surface of the bobbin; a first magnet disposed at the outer surface of the housing; a second magnet disposed in the housing so as to be spaced apart from the first magnet; and a first position sensor disposed at the outer surface of the bobbin, wherein a first part of the housing is positioned between the second magnet and the inner surface of the housing.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application is a continuation of U.S. application Ser. No.16/925,040, filed Jul. 9, 2020; which is a continuation of U.S.application Ser. No. 15/750,729, filed Feb. 6, 2018, now U.S. Pat. No.10,746,955, issued Aug. 18, 2020; which is the U.S. national stageapplication of International Patent Application No. PCT/KR2016/008084,filed Jul. 25, 2016, which claims priority to Korean Application No.10-2015-0110964, filed Aug. 6, 2015, the disclosures of each of whichare incorporated herein by reference in their entirety.

TECHNICAL FIELD

Embodiments relate to a lens moving apparatus and to a camera module andan optical device each including the same.

BACKGROUND ART

Technology of a voice coil motor (VCM), which is used in existinggeneral camera modules, is difficult to apply to a micro-scale,low-power camera module, and studies related thereto have been activelyconducted.

In the case of a camera module configured to be mounted in a smallelectronic product, such as a smart phone, the camera module mayfrequent1y receive shocks when in use, and may undergo fine shaking dueto, for example, the shaking of a user's hand. In consideration of thisfact, there is a demand for the development of technology enabling adevice for inhibiting handshake to be additionally installed to a cameramodule.

DISCLOSURE Technical Problem

The embodiments provide a lens moving device capable of suppressingdefocusing of a lens caused by variation in the ambient temperature andof easily performing calibration for auto-focusing feedback driving.

Technical Solution

A lens moving apparatus according to an embodiment includes a housingincluding an upper surface, a lower surface, an inner circumferentialsurface and an outer circumferential surface positioned opposite theinner circumferential surface; a bobbin disposed in the housing; a firstcoil disposed on an outer circumferential surface of the bobbin; a firstmagnet disposed on the outer circumferential surface of the housing; asecond magnet disposed on the housing so as to be spaced apart from thefirst magnet; and a first position sensor disposed on the outercircumferential surface of the bobbin, wherein a first portion of thehousing is positioned between the second magnet and an innercircumferential surface of the housing.

The housing may be provided at an upper portion thereof with a firstmagnet seat on which the second magnet is mounted, and the first portionof the housing may be positioned between the second magnet mounted onthe first magnet seat and the inner circumferential surface of thehousing.

The second magnet mounted on the first magnet seat may be exposed fromthe outer circumferential surface of the housing.

The second magnet mounted on the first magnet seat may be exposed fromthe outer circumferential surface and the upper surface of the housing.

A second portion of the housing may be positioned between the secondmagnet mounted on the first magnet seat and the outer circumferentialsurface of the housing, and a thickness of the first portion of thehousing may be greater than a thickness of the second portion of thehousing.

The first magnet seat may be depressed from the outer circumferentialsurface and the upper surface of the housing.

A third portion of the housing may be positioned between the secondmagnet mounted on the first magnet seat and the upper surface of thehousing, and a thickness of the first portion of the housing may begreater than a thickness of the third portion of the housing.

The second magnet mounted on the first magnet seat may be exposed fromthe upper surface of the housing.

The lens moving apparatus may further include an adhesive memberdisposed between the first magnet seat and the second magnet.

As a temperature increases, the first portion of the housing may expand,and a distance between the second magnet and the first position sensormay thus increase.

A lens moving apparatus according to another embodiment includes ahousing including a cavity and a plurality of first side portions; abobbin disposed in the cavity of the housing; a first coil disposed onan outer circumferential surface of the bobbin; a first magnet disposedon the plurality of first side portions of the housing; a second magnetdisposed on one of the plurality of first side portions so as to bespaced apart from the first magnet; and a first position sensor disposedon the outer circumferential surface of the bobbin, wherein a crosspoint between a first graph and a second graph is located in a thirdquadrant of an x-y coordinates system wherein the first graph is a graphrepresenting an output value of the first position sensor over anintensity of a magnetic field detected by the first position sensor at afirst temperature and the second graph is a graph representing an outputvalue of the first position sensor over an intensity of a magnetic fielddetected by the first position sensor at a second temperature.

The first temperature may be 25° C., and the second temperature may behigher than 25° C. but lower than 65° C.

A range of output of the first position sensor in a stroke range inwhich the bobbin is movable may be included in a first area, wherein thefirst area is an area including a value that is equal to or higher thana first reference value, the first reference value being an output ofthe first position sensor at the cross point.

A range of output of the first position sensor in a stroke range inwhich the bobbin is movable may be included in a first area wherein, thefirst area is an area that is higher than a first reference value, thefirst reference value being an output of the first position sensor atthe cross point.

A range of output of the first position sensor in a stroke range inwhich the bobbin is movable may be a portion of the first area locatedin the first quadrant.

An output value of the first position sensor may decrease as atemperature increases.

The cross point may be spaced apart from an origin of the x-ycoordinates system and from an x-axis and a y-axis.

A camera module according to an embodiment includes a lens barrel; thelens moving apparatus for moving the lens barrel; and an image sensorfor converting an image, which is incident through the lens movingapparatus, into an electrical signal.

An optical device according to an embodiment includes a display moduleincluding a plurality of pixels, which are changed in color in responseto an electrical signal; the camera module for converting an image,which is incident through a lens, into an electrical signal; and acontroller for performing control of motion of the display module andthe camera module.

Advantageous Effects

Embodiments are capable of suppressing defocusing of a lens caused byvariation in the ambient temperature and of easily performingcalibration for auto-focusing feedback driving.

DESCRIPTION OF DRAWINGS

FIG. 1 is a perspective view illustrating a lens moving apparatusaccording to an embodiment;

FIG. 2 is an exploded perspective view of the lens moving apparatusillustrated in FIG. 1;

FIG. 3 is an assembled perspective view illustrating the lens movingapparatus shown in FIG. 1, from which a cover member is removed;

FIG. 4 is an exploded perspective view of a bobbin, a first coil, afirst magnet, a second magnet, a first position sensor, and a sensorboard, which are illustrated in FIG. 2;

FIG. 5A is a plan view illustrating the bobbin and the second magnet,which are illustrated in FIG. 4;

FIG. 5B is an exploded perspective view illustrating the sensor boardand the first position sensor, which are illustrated in FIG. 4;

FIG. 5C is a rear perspective view illustrating an embodiment of thesensor board illustrated in FIG. 4;

FIG. 6 is a top perspective view of the housing illustrated in FIG. 1;

FIG. 7 is a bottom exploded perspective view of the housing, the firstmagnet, and the second magnet, which are illustrated in FIG. 2;

FIG. 8 is a sectional view taken along line I-I′ in FIG. 3;

FIG. 9 is a plan perspective view illustrating the coupled state of thebobbin, the housing, the upper elastic member, the first positionsensor, the sensor board, and the plurality of support members, whichare illustrated in FIG. 2;

FIG. 10 is a bottom perspective view illustrating the coupled state ofthe bobbin, the housing, the lower elastic member, and the plurality ofsupport members, which are illustrated in FIG. 2;

FIG. 11 is an assembled perspective view illustrating the upper elasticmember, the lower elastic member, the first position sensor, the sensorboard, the base, the support members, and the circuit board, which areillustrated in FIG. 2;

FIG. 12 is an exploded perspective view illustrating the base, thesecond coil and the circuit board illustrated in FIG. 1;

FIG. 13 illustrates the output of an auto-focusing position sensoraccording to movement of a movable unit;

FIG. 14 illustrates variation in output of the auto-focusing sensoraccording to ambient temperature;

FIG. 15 illustrates an example of variation of output of the firstposition sensor mounted on the housing and the bobbin due to variationin the ambient temperature.

FIG. 16 illustrates a first embodiment of the relative positionalrelationships among the first position sensor, the second magnet, thefirst magnets and the first coil;

FIG. 17 illustrates the relative positional relationships among thefirst position sensor, the second magnet, the first magnets and thefirst coil, which are shown in FIG. 16, according to variation in theambient temperature;

FIG. 18 illustrates a second embodiment of the relative positionalrelationships among the first position sensor, the second magnet, thefirst magnets and the first coil;

FIG. 19 illustrates a third embodiment of the relative positionalrelationships among the first position sensor, the second magnet, thefirst magnets and the first coil;

FIG. 20 illustrates another embodiment of variation of output of thefirst position sensor mounted on the housing, according to variation inthe ambient temperature;

FIG. 21 illustrates a fourth embodiment of the relative positionalrelationships among the first position sensor, the second magnet, thefirst magnets and the first coil;

FIG. 22 illustrates the relative positional relationships among thefirst position sensor, the second magnet, the first magnets and thefirst coil, which are shown in FIG. 21, according to variation intemperature

FIG. 23 illustrates a fifth embodiment of the relative positionalrelationships among the first position sensor, the second magnet, thefirst magnets and the first coil;

FIG. 24 illustrates a sixth embodiment of the relative positionalrelationships among the first position sensor, the second magnet, thefirst magnets and the first coil;

FIG. 25 illustrates a seventh embodiment of the relative positionalrelationships among the first position sensor, the second magnet, thefirst magnets and the first coil;

FIG. 26 illustrates an eighth embodiment of the relative positionalrelationships among the first position sensor, the second magnet, thefirst magnets and the first coil;

FIG. 27 is an exploded perspective view of a camera module according toan embodiment;

FIG. 28 is a perspective view illustrating a portable terminal accordingto an embodiment; and

FIG. 29 is a view illustrating the configuration of the portableterminal illustrated in FIG. 28.

BEST MODE

Hereinafter, embodiments will be clearly revealed via descriptionthereof with reference to the accompanying drawings. In the followingdescription of the embodiments, it will be understood that, when anelement such as a layer (film), region, pattern, or structure isreferred to as being “on” or “under” another element, it can be“direct1y” on or under another element or can be “indirect1y” formedsuch that an intervening element may also be present. In addition, itwill also be understood that the criteria for “on” or “under” aredetermined on the basis of the drawings.

In the drawings, the dimensions of layers are exaggerated, omitted orillustrated schematically for clarity and convenience of description. Inaddition, the dimensions of constituent elements do not entirely reflectthe actual dimensions. Wherever possible, the same reference numberswill be used throughout the drawings to refer to the same or like parts.

Hereinafter, a lens moving apparatus according to an embodiment will bedescribed with reference to the accompanying drawings. For theconvenience of description, although the lens moving apparatus isdescribed using a rectangular coordinate system (x, y, z), the lensmoving apparatus may be described using some other coordinate systems,and the embodiment is not limited thereto. In the respective drawings,the X-axis and the Y-axis mean directions perpendicular to an opticalaxis, i.e. the Z-axis, and the optical axis (Z-axis) direction may bereferred to as a “first direction”, the X-axis direction may be referredto as a “second direction”, and the Y-axis direction may be referred toas a “third direction”.

A “handshake correction device”, which is applied to a subminiaturecamera module of a mobile device such as, for example, a smart phone ora tablet PC, may be a device that is configured to inhibit the contourline of a captured image from being indistinct1y formed due to vibrationcaused by shaking of the user's hand when capturing a still image.

In addition, an “auto-focusing device” is a device that automaticallyfocuses an image of a subject on an image sensor surface. The handshakecorrection device and the auto-focusing device may be configured invarious ways, and the lens moving apparatus according to the embodimentmay move an optical module, which is constituted of at least one lens,in the first direction, which is parallel to the optical axis, orrelative to a plane defined by the second and third directions, whichare perpendicular to the first direction, thereby performing handshakecorrection motion and/or auto-focusing.

FIG. 1 is a schematic perspective view illustrating the lens movingapparatus according to an embodiment, and FIG. 2 is an explodedperspective view of the lens moving apparatus illustrated in FIG. 1.

Referring to FIGS. 1 and 2, the lens moving apparatus an embodiment mayinclude a cover member 300, an upper elastic member 150, a sensor board180, a first position sensor 170, a first coil 120, a bobbin 110, ahousing 140, a first magnet 130, a second magnet 190, a lower elasticmember 160, a plurality of support members 220, a circuit board 250 anda base 210.

The lens moving apparatus according to the embodiment may furtherinclude a second coil 230, which interacts with the first magnet 130 forhandshake correction.

The lens moving apparatus according to the embodiment may furtherinclude a second position sensor 240 for detecting the intensity of amagnetic field of the first magnet 130 for handshake correction.

First, the cover member 300 will be described.

The cover member 300 defines an accommodation space along with the base210, such that the upper elastic member 150, the bobbin 110, the firstcoil 120, the housing 140, the second magnet 190, the first magnet 130,the lower elastic member 160, the support members 220, the second coil230, and the circuit board 250 are accommodated in the accommodationspace.

The cover member 300 may take the form of a box, which has an openbottom and includes an upper end portion and sidewalls. The bottom ofthe cover member 300 may be coupled to the top of the base 210. Theupper end portion of the cover member 300 may have a polygonal shape,such as, for example, a square or octagonal shape.

The cover member 300 may have a bore formed in the upper end portionthereof in order to expose a lens (not shown), coupled to the bobbin110, to outside light. In addition, the bore of the cover member 300 maybe provided with a window formed of a light-transmitting material, inorder to inhibit impurities, such as, for example, dust or moisture,from entering a camera module.

Although the material of the cover member 300 may be a non-magneticmaterial such as, for example, SUS in order to inhibit the cover member300 from being attracted by the first magnet 130, the cover member 300may be formed of a magnetic material, and may function as a yoke.

FIG. 3 is an assembled perspective view illustrating the lens movingapparatus after removal of the cover member 300 of FIG. 1, and FIG. 4 isan exploded perspective view of the bobbin 110, the first coil 120, thesecond magnet 190, the first magnets 130-1 to 130-4, the first positionsensor 170, and the sensor board 180 illustrated in FIG. 2.

Next, the bobbin 110 will be described.

Referring to FIGS. 3 and 4, the bobbin 110 is placed inside the housing140, and is movable in the direction of the optical axis or in the firstdirection, which is parallel to the optical axis, for example, in theZ-axis direction, via electromagnetic interaction between the first coil120 and the first magnet 130.

Although a lens may be direct1y mounted on the bobbin, the disclosure isnot limited thereto.

Although not illustrated, the bobbin 110 may include a lens barrel (notshown) in which at least one lens is installed. The lens barrel may becoupled inside the bobbin 110 in various manners.

The bobbin 110 may be configured to have a bore for mounting the lens orthe lens barrel. The bore may have a circular, elliptical, or polygonalshape, without being limited thereto.

The bobbin 110 may include first and second protrusions 111 and 112.

The first protrusion 111 of the bobbin 110 may include a guide portion111 a and a first stopper 111 b.

The guide portion 111 a of the bobbin 110 may serve to guide theposition at which the upper elastic member 150 is installed. Forexample, as exemplarily illustrated in FIG. 3, the guide portion 111 aof the bobbin 110 may guide the path along which a first frame connector153 of the upper elastic member 150 extends.

For example, a plurality of guide portions 111 a may protrude in thesecond and third directions, which are perpendicular to the firstdirection. In addition, the guide portions 111 a may be arranged in apattern symmetric with respect to the center of the plane defined by thex-axis and the y-axis, as illustrated in the drawings, or may bearranged in a pattern asymmetric with respect to the center withoutinterference with other components, unlike the embodiment illustrated inthe drawings.

The second protrusion 112 of the bobbin 110 may be formed so as toprotrude in the second and third directions, which are perpendicular tothe first direction. In addition, the second protrusion 112 of thebobbin 110 may have an upper surface 112 a having a shape on which thefirst inner frame 151 is mounted.

The first stopper 111 b of the first protrusion 111 of the bobbin 110and the second protrusion 112 of the bobbin 110 may serve to inhibit thebottom surface of the body of the bobbin 110 from direct1y collidingwith the base 210 and the upper surface of the circuit board 250 even ifthe bobbin 110 moves beyond a prescribed range due to, for example,external shocks, when being moved in the first direction parallel to theoptical axis and a direction parallel to the first direction forauto-focusing.

The bobbin 110 may have a support groove 114 provided between the innercircumferential surface 110 a and the outer circumferential surface ofthe bobbin 110 so as to allow the sensor board 180 to be inserted intothe bobbin 110 in the first direction. For example, the support groove114 in the bobbin 110 may be provided between the inner circumferentialsurface 110 a of the bobbin 110 and the first and second protrusions 111and 112 so as to enable the insertion of the sensor board 180 in thefirst direction. Furthermore, the support groove 114 of the bobbin 110may be configured to have the shape of a ring defined between the innercircumferential surface 110 a and the outer circumferential surface ofthe bobbin 110.

The bobbin 110 may have a receiving recess 116, in which the firstposition sensor 170, which is disposed, coupled, or mounted on thesensor board 180, is received or disposed.

For example, the receiving recess 116 of the bobbin 110 may be providedin the space between the first and second protrusions 111 and 112 of thebobbin 110, so as to allow the first position sensor 170, mounted on thesensor board 180, to be inserted in the first direction.

The bobbin 110 may have a support protrusion 117 (see FIG. 8) formed onthe lower surface thereof so as to be coupled and fixed to the lowerelastic member 160.

When the state in which the lower surfaces of the first and secondprotrusions 111 and 112 of the bobbin 110 are in contact with the bottomsurface 146 a of a first mounting groove 146 is set to be an initialposition, the auto-focusing function may be controlled as inunidirectional control in an existing voice coil motor (VCM).Specifically, the bobbin 100 may be raised when current is supplied tothe first coil 120, and may be lowered when the supply of current to thefirst coil 120 is cut off, thereby performing the auto-focusingfunction.

However, when the position at which the lower surfaces of the first andsecond protrusions 111 and 112 of the bobbin 110 are spaced apart fromthe bottom surface 146 a of the first seating groove 146 by apredetermined distance is set to be the initial position of the bobbin110, the auto-focusing function may be controlled depending on thedirection of current, as in bidirectional control in an existing voicecoil motor. Specifically, the auto-focusing function may also befulfilled by moving the bobbin 110 in an upward or downward directionparallel to the optical axis. For example, the bobbin 110 may be movedupwards when forward current is applied, and may be moved downwards whenreverse current is applied.

Next, the first coil 120 will be described.

The first coil 120 is disposed on the outer circumferential surface ofthe bobbin 110. The first coil 120 may be located so as not to overlapthe first position sensor 170 in the second or third direction which isperpendicular to the first direction.

In order to ensure that the first coil 120 and the first position sensor170 do not interfere or overlap each other in the second or thirddirection, the first coil 120 and the first position sensor 170 may belocated on the outer circumferential surface of the bobbin 110 so as tobe spaced apart from each other. For example, the first coil 120 may belocated on the lower side or the lower portion of the outercircumferential surface of the bobbin 110, and the first position sensor170 may be located on the upper side of the first coil 120.

The first coil 120, as exemplarily illustrated in FIG. 4, may be woundso as to surround the outer circumferential surface of the bobbin 110 inthe direction in which the first coil 120 rotates about the opticalaxis.

As exemplarily illustrated in FIG. 8, the first coil 120 may be fitted,disposed or secured in a groove 118 formed in the outer circumferentialsurface of the bobbin 110.

In FIG. 4, although the first coil 120 may be situated direct1y on theouter circumferential surface of the bobbin 110, the disclosure is notlimited thereto. In another example, the first coil 120 may be woundaround the bobbin 110 via a coil ring, or may be configured to have theform of an angled ring-shaped coil block. In this case, the coil ringmay be coupled to the bobbin 110 in the same manner as the manner inwhich the sensor board 180 is fitted into the support groove 114 in thebobbin 110.

As illustrated in FIG. 2, the first coil 120 may be configured to havean octagonal shape. The reason for this is because the shape of thefirst coil 120 is configured to correspond to the shape of the outercircumferential surface of the bobbin 110, which is octagonal, asillustrated in FIG. 5A.

At least four sides of the first coil 120 may be configured to have alinear shape, and the corner portions between the four sides may also beconfigured to have a linear shape. However, they may also be configuredto have a round shape.

The first coil 120 may produce electromagnetic force via electromagneticinteraction between the first coil 120 and the magnet 130 when currentis supplied thereto, thereby moving the bobbin 110 in the firstdirection or a direction parallel to the first direction using theelectromagnetic force.

The first coil 120 may be configured to correspond to the first magnet130. When the first magnet 130 is constituted by a single body such thatthe surface of the first magnet 130 that faces the first coil 120 hasthe same polarity, the surface of the first coil 120 that faces thefirst magnet 130 may also be configured to have the same polarity.

If the first magnet 130 is divided into two or four segments by a plane,which is perpendicular to the optical axis, such that the surface of themagnet 130 that faces the first coil 120 is correspondingly sectionedinto two or more surfaces, the first coil 120 may also be divided into anumber of coil segments that corresponds to the number of first magnetsegments.

Next, the first position sensor 170 and the sensor board 180 will bedescribed.

The first position sensor 170 may be disposed, coupled, or mounted onthe bobbin 110 so as to move along with the bobbin 110.

The first position sensor 170 may move along with the bobbin 110 whenthe bobbin 110 moves in the first direction. The first position sensor170 may detect the sum of the strength of the magnetic field of thesecond magnet 190 and the strength of the magnetic field of the firstmagnet 130 depending on the movement of the bobbin 110, and may form anoutput signal based on the detected result. The displacement in theoptical axis direction of the bobbin 110 or the first direction may becontrolled using the output signal from the first position sensor 170.

The first position sensor 170 may be conductively connected to thesensor board 180. The first position sensor 170 may take the form of adriver that includes a Hall sensor, or may take the form of a positiondetection sensor alone such as, for example, a Hall sensor.

The first position sensor 170 may be disposed, coupled, or mounted onthe bobbin 110 in various forms, and may receive current in various waysdepending on the manner in which the first position sensor 170 isdisposed, coupled, or mounted.

The first position sensor 170 may be disposed, coupled, or mounted onthe outer circumferential surface of the bobbin 110.

For example, the first position sensor 170 may be disposed, coupled, ormounted on the sensor board 180, and the sensor board 180 may bedisposed or coupled to the outer circumference surface of the bobbin110. In other words, the first position sensor 170 may be indirect1ydisposed, coupled or mounted on the bobbin 110 via the sensor board 180.

The first position sensor 170 may be conductively connected to at leastone of the upper elastic member 150 and the lower elastic member 160.For example, the first position sensor 170 may be conductively connectedto the upper elastic member 150.

FIG. 5A is a plan view illustrating the bobbin 110 and the first magnet130 (130-1, 130-2, 130-3 and 130-4), which are illustrated in FIG. 4.FIG. 5B is an exploded perspective view illustrating the sensor board180 and the first position sensor 170, which are illustrated in FIG. 4.FIG. 5C is a rear perspective view illustrating the sensor board 180according to an embodiment, which is illustrated in FIG. 4.

Referring to FIGS. 4 and 5A, the sensor board 180 may be mounted on thebobbin 110, and may move along with the bobbin 110 in the optical axisdirection or in a direction parallel to the optical axis.

For example, the sensor board 180 may be coupled to the bobbin 110 bybeing fitted or disposed in the support groove 114 in the bobbin 110.The sensor board 180 is sufficient so long as it is mounted on thebobbin 110. Although FIG. 4 illustrates a sensor board 180 having a ringshape, the disclosure is not limited thereto.

The first position sensor 170 may be attached to and supported by thefront surface of the sensor board 180 using an adhesive member such as,for example, epoxy or a piece of double-sided tape.

The outer circumferential surface of the bobbin 110 may include firstside surfaces S1 and second side surfaces S2. The first side surfaces Sicorrespond to first side portions 141 of the housing 140 on which thefirst magnet 130 is disposed. The second side surfaces S2 are locatedbetween the first side surfaces Si so as to connect the first sidesurfaces S1 to one another.

The first position sensor 170 may be disposed on any one of the firstside surfaces Si of the bobbin 110. For example, the recess 116 in thebobbin 110 may be provided in either one of the first side surfaces Siof the bobbin 110, and the first position sensor 170 may be located inthe recess 116 in the bobbin 110.

Referring to FIG. 5B, the first position sensor 170 may be disposed,coupled, or mounted to an upper portion, a midd1e portion, or a lowerportion of the outer circumferential surface of the sensor board 180 invarious forms.

For example, the first position sensor 170 may be disposed on any one ofthe upper portion, the midd1e portion and the lower portion of the outercircumferential surface of the sensor board 180 so as to be disposed ordirected in the first direction in the space between the first andsecond magnets 190 and 130 at the initial position of the bobbin 110.The first position sensor 170 may receive current from outside through acircuit of the sensor board 180.

The first position sensor 170 may be disposed, coupled or mounted on theupper portion of the outer circumferential surface of the sensor board180 so as to be positioned or arranged in the space between the firstand second magnets 190 and 130 in the first direction from the initialposition of the bobbin 110.

The first position sensor 170 may be disposed on the upper portion Al ofthe outer circumferential surface of the sensor board 180 so as to bepositioned as far from the first coil 120 as possible such that thefirst position sensor 170 is not influenced by the magnetic fieldgenerated by the first coil 120, thereby inhibiting malfunctions orerrors of the first position sensor 170.

As illustrated in FIG. 5B, for example, the sensor board 180 may have amounting recess 183 formed in the upper portion of the outercircumferential surface thereof, and the first position sensor 170 maybe disposed, coupled or mounted in the mounting recess 183 in the sensorboard 180.

In order to allow more efficient injection of epoxy or the like forassembly of the first position sensor 170, at least one surface of themounting recess 183 of the sensor board 180 may be provided with aninclined surface (not shown). Although additional epoxy or the like maynot be injected into the mounting recess 183 in the sensor board 180, itmay be possible to increase the force with which the first positionsensor 170 is disposed, coupled or mounted by injecting epoxy or thelike into the mounting recess 183.

The sensor board 180 may include a body 182, elastic member contactportions 184-1 to 184-4, and a circuit pattern L1-L4.

When the support groove 114 in the bobbin 110 has the same shape as thatof the outer circumferential surface of the bobbin 1100, the body 182 ofthe sensor board 180, which is fitted into the support groove 114 of thebobbin 110, may have a shape which is capable of being fitted into thegroove 114 and being secured thereto.

Although the support groove 114 in the bobbin 110 and the body 182 ofthe sensor board 180 may have a circular shape when viewed in a planview, as illustrated in FIGS. 3 to 5A, the disclosure is not limitedthereto. In another embodiment, the support groove 114 in the bobbin 110and the body 182 of the sensor board 180 may have a polygonal shape whenviewed in a plan view.

Referring to FIG. 5B, the body 182 of the sensor board 180 may include afirst segment 182 a, on which the first position sensor 170 is disposed,coupled, or mounted, and a second segment 182 b, which extends from thefirst segment 182 a and which is fitted into the support groove 114 inthe bobbin 110.

Although the sensor board 180 may have an opening 181 in the portionthereof that faces the first segment 182 a so as to be easily fittedinto the support groove 114 in the bobbin 110, the disclosure is notlimited to any specific structure of the sensor board 180.

The elastic member contact portions 184-1 to 184-4 of the sensor board180 may protrude from the body 182 of the sensor board 180 in, forexample, the optical axis direction or the first direction in which thecontact portions can come into contact with the first inner frame 151.

The elastic member contact portions 184-1 to 184-4 of the sensor board180 may be connected to the first inner frame 151 of the upper elasticmember 150.

The circuit pattern L1-L4 of the sensor board 180 may be formed on thebody 182 of the sensor board 180, and may conductively connect the firstposition sensor 170 and the elastic member contact portions 184-1 to184-4 to each other.

The first position sensor 170 may be embodied as a Hall sensor, forexample, but may be embodied as any sensor as long as it is able todetect the intensity of a magnetic field. If the first position sensor170 is embodied as a Hall sensor, the hall sensor may include aplurality of pins.

For example, the plurality of pins may include input pins P11 and P12and output pins P21 and P22. Signals output through the output pins P21and P22 may be a current type or a voltage type.

The input pins P11 and P12 and the output pins P21 and P22 of the firstposition sensor 170 may be conductively connected to the respectiveelastic member contact portions 184-1 to 184-4 via the circuit patternL1 to L4.

For example, referring to FIG. 5C, the first line L1 of the circuitpattern may conductively connect the first pin P11 to the fourth elasticmember contact portion 184-4, and the second line L2 of the circuitpattern may conductively connect the second input pin P12 to the thirdelastic member contact portion 184-3. In addition, the third line L3 ofthe circuit pattern may conductively connect the first output pin P21 tothe first elastic member contact portion 184-1, and the fourth line L4of the circuit pattern may conductively connect the second output pinP22 to the second elastic member contact portion 184-2.

In an embodiment, the first to fourth lines L1 to L4 may be formed so asto be visible to the naked eye. In another embodiment, the first tofourth lines L1 to L4 may be formed in the body 182 of the sensor board180 so as not to be visible to the naked eye.

Next, the housing 140 will be described.

The housing 140 may support the second magnet 190 for detection and thefirst magnet 130 for driving, and may accommodate the bobbin 110 thereinsuch that the bobbin 110 is allowed to move in the first directionparallel to the optical axis.

The housing 140 may generally have a hollow column shape. For example,the housing 140 may have a polygonal (e.g., a square or octagonal) orcircular bore 201. For example, the housing 140 may include an uppersurface, a lower surface, an inner circumferential surface and an outercircumferential surface, and the bobbin 110 may be disposed in the spacedefined in the housing 140.

FIG. 6 is a top perspective view of the housing 140 illustrated in FIG.2. FIG. 7 is a bottom exploded perspective view of the housing 140, thesecond magnet 190 and the first magnet 130, which are illustrated inFIG. 2. FIG. 8 is a sectional view taken along line I-I′ in FIG. 3. FIG.9 is a top perspective view of the coupled state of the bobbin 110, thehousing 140, the upper elastic member 150, the first position sensor170, the sensor board 180, and the support members 220, which areillustrated in FIG. 2. FIG. 10 is a bottom perspective view of thecoupled state of the bobbin 110, the housing 140, the lower elasticmember 160, and the support members 220, which are illustrated in FIG.2.

The housing 140 may have the first seating groove 146 formed at aposition thereof corresponding to the first and second protrusions 111and 112 of the bobbin 110.

The housing 140 may include a third protrusion 148, which corresponds tothe space defined between the first and second protrusions 111 and 112,and which has a first width W1.

The third protrusion 148 of the housing 140, which is opposite to thebobbin 110, may have a surface having the same shape as the side portionof the bobbin 110. Here, there may be a predetermined difference betweenthe first width W1 between the first and second protrusions 111 and 112of the bobbin 110, which is illustrated in FIG. 4, and the second widthW2 of the third protrusion 148 of the housing 140, which is illustratedin FIG. 4. Consequent1y, it is possible to restrict the rotation of thethird protrusion 148 between the first and second protrusions 111 and112 of the bobbin 110. As a result, it is possible for the thirdprotrusion 148 of the housing 140 to inhibit the bobbin 110 from beingrotated even if the bobbin 110 receives force in the direction in whichthe bobbin 110 is rotated about the optical axis, rather than beingrotated in the optical axis direction.

For example, the upper edge of the outer periphery of the housing 140may have a square plan shape, whereas the lower edge of the innerperiphery may have an octagonal plan shape, as exemplarily illustratedin FIGS. 6 and 7. The housing 140 may include a plurality of sideportions. For example, the housing 140 may include four first sideportions 141 and four second side portions 142, and the width of each ofthe first side portions 141 may be greater than the width of each of thesecond side portions 142.

The first side portions 141 of the housing 140 may correspond to theportions on which the first magnet 130 is mounted. Each of the secondside portions 142 of the housing 140 may be disposed between the twoadjacent first side portions 141, and may correspond to portions onwhich the support members 220 are disposed. Each of the first sideportions 141 of the housing 140 may connect the two adjacent second sideportions 142 of the housing 140, and may have flat surfaces having apredetermined depth.

Each of the first side portions 141 of the housing 140 may have asurface area that is equal to or larger than the surface area of thefirst magnet 130, which corresponds to the first side portion 141.

The housing 140 may have a first magnet seat 141 b for accommodating thesecond magnet 190 and second magnet seats 141 a for accommodating thefirst magnets 130-1 to 130-4.

For example, the housing 140 may have the first magnet seat 141 b, whichis formed in the upper end of the outer portion of one of the first sideportions 141, and the second magnet seats 141 a, which are formed in thelower end of the inner portion of the first side portions 141.

The first magnet seat 141 b may be positioned above the second magnetseats 141 a.

For example, the first magnet seat 141 b may be spaced apart from thesecond magnet seats 141 a, and the detailed description thereof will begiven later.

The second magnet 190 may be fitted in and secured to the first magnetseat 141 b, and each of the first magnets 130-1 to 130-4 may be fixed tothe second magnet seat 141 a, which is provided on a corresponding oneof the first side portions 141 of the housing 140.

The second magnet seat 141 a of the housing 140 may be configured tohave the form of a recess having a size corresponding to the size of thefirst magnet 130, and may be configured to face at least three of thesurfaces of the first magnet 130, that is, two lateral side surface andthe upper surface of the first magnet 130.

An opening may be formed in the bottom surface of the second magnet seat141 a of the housing 140, that is, the surface that is opposite thesecond coil 230, which will be described later, and the bottom surfaceof the first magnet 130 seated on the second magnet seat 141 a maydirect1y face the second coil 230.

The first and second magnets 190 and 130 may be secured to the first andsecond magnet seats 141 b and 141 a of the housing 140 using anadhesive, without being limited thereto, and an adhesive member such asa piece of double-sided tape may be used.

Alternatively, the first and second magnet seats 141 b and 141 a of thehousing 140 may be configured as mounting holes, which allow the firstand second magnets 190 and 130 to be partially fitted thereinto or to bepartially exposed therefrom, rather than being configured as the recessillustrated in FIGS. 6 and 7.

For example, the second magnet 190 may be positioned above one (forexample, 130-1) of the first magnets 130-1, 130-2, 130-3 and 130-4. Thesecond magnet 190 may be disposed so as to be spaced apart from thefirst magnet (for example, 130-1). The first side portion of the housing140 may be partially disposed between the second magnet 190 and thesecond magnet (for example, 130-1).

The first side portion 141 of the housing 140 may be oriented parallelto the side surface of the cover member 300. In addition, the first sideportion 141 of the housing 140 may be larger than the second sideportion 142. The second side portion 142 of the housing 140 may beprovided with paths through which the support members 220 extend. Firstthrough-holes 147 may be formed in the upper portion of the second sideportion 142 of the housing 140. The support members 220 may be connectedto the upper elastic member 150 through the first through holes 147.

In addition, in order to inhibit the housing 140 from direct1y collidingwith the inner side surface of the cover member 300 illustrated in FIG.1, the housing 140 may be provided at the upper end thereof with asecond stopper 144.

The housing 140 may include at least one first upper support protrusion143, formed on the upper surface thereof for the coupling of the upperelastic member 150.

For example, the first upper support protrusion 143 of the housing 140may be formed on the upper surface of the housing 140 corresponding tothe second side portion 142 of the housing 140. The first upper supportprotrusion 143 of the housing 140 may have a semispherical shape, asillustrated in the drawings, or may have a cylindrical shape or a prismshape, without being limited thereto.

The housing 140 may have second a lower support protrusion 145 formed onthe lower surface thereof for the coupling and fixing of the lowerelastic member 160.

In order to define paths for the passage of the support members 220 andto ensure the space to be filled with gel-type silicone, which serves asa damper, the housing 140 may have a first recess 142 a formed in thesecond side portion 142. In other words, the first recess 142 a of thehousing 140 may be filled with damping silicone.

The housing 140 may have a plurality of third stoppers 149 protrudingfrom the side portions 141 thereof. The third stoppers 149 serve toinhibit the housing 140 from colliding with the cover member 300 whenthe housing 140 moves in the second and third directions.

In order to inhibit the bottom surface of the housing 140 from collidingwith the base 210 and/or the circuit board 250, which will be describedbelow, the housing 140 may further have a fourth stopper (not shown)protruding from the bottom surface thereof. Through this configuration,the housing 140 may be spaced apart from the base 210, which is disposedthereunder, and may be spaced apart from the cover member 300, which isdisposed thereabove, with result that the housing 140 may be maintainedat a predetermined position in the optical axis direction withoutinterference therebetween. In this way, the housing 140 may perform ashifting action in the second and third direction, that is, theanteroposterior direction and the lateral direction, on a planeperpendicular to the optical axis.

Next, the second magnet 190 and the first magnet 130 will be described.

The first magnet 130 may be disposed on the second magnet seat 141 a ofthe housing 140 so as to overlap the first coil 120 in the directionperpendicular to the optical axis.

In another embodiment, both the first and second magnets 190 and 130 maybe disposed outside or inside the first side portion 141 of the housing140, or may be disposed inside or outside the second side portion 142 ofthe housing 140.

In a further embodiment, the second magnet 190 may be accommodated inthe inner portion of the first side portion 141 of the housing 140, andthe first magnet 130 may be accommodated in the outer portion of thefirst side portion 141 of the housing 140.

The first magnet 130 may have a form that corresponds to the first sideportion 141 of the housing 140, that is, the form of an approximatelyrectangular parallelepiped. The surface of the first magnet 130 thatfaces the first coil 120 may have a radius of curvature that correspondsto that of the first coil 120.

The first magnet 130 may be configured as a single body. In theembodiment, referring to FIG. 5A, the first magnet 130 may be orientedsuch that the surface thereof facing the first coil 120 is the S-pole132 and the opposite surface is the N-pole 134, without being limitedthereto, and the opposite configuration is also possible.

At least two first magnets 130 may be provided, and in the embodiment,four first magnets 130 may be installed. The first magnet 130 may havean approximately rectangular shape, as illustrated in FIG. 5A, or mayhave a triangular or diamond shape.

Although the surface of the first magnet 130 that faces the first coil120 may be linear, the disclosure is not limited thereto. When thecorresponding surface of the first coil 120 is curved, the surface ofthe first magnet 130 that faces the first coil 120 may be curved so asto have a radius of curvature corresponding to the surface of the firstcoil 120.

By virtue of this configuration, it is possible to keep the distancebetween the first magnet 130 and the first coil 120 constant. In anembodiment, four first side portions 141 of the housing 140 may beprovided with the first magnets 130-1, 130-2, 130-3 and 130-4,respectively, without being limited thereto. In some designs, only oneof the first magnet 130 and the first coil 120 may have a flat surface,and the other of the first magnet 130 and the first coil 120 may have acurved surface. Alternatively, both the first coil 120 and the firstmagnet 130, which face each other, may have curved surfaces. In thiscase, the surface of the first coil 120 may have the same radius ofcurvature as the surface of the first magnet 130.

When the first magnets 130 have a rectangular flat surface, asillustrated in FIG. 5A, a pair of magnets, among the plurality of firstmagnets 130, may be arranged in the second direction so as to beparallel to each other, and the other pair of magnets may be arranged inthe third direction so as to be parallel to each other. By virtue of thearrangement, it is possible to control the movement of the housing 140for handshake correction, which will be described later.

Next, the upper elastic member 150, the lower elastic member 160, andthe support members 220 will be described.

The upper elastic member 150 and the lower elastic member 160elastically support the bobbin 110. The support members 220 may supportthe housing 140 so as to be movable relative to the base 210 in thedirection perpendicular to the optical axis, and may conductivelyconnect at least one of the upper and lower elastic members 150 and 160to the circuit board 250.

The upper elastic member 150 may be coupled to the upper end (or theupper surface) of the bobbin 110 and the upper end (or the uppersurface) of the housing 140, and the lower elastic member 160 may becoupled to the lower end (or the lower surface) of the bobbin 110 andthe lower end (or the lower surface) of the housing 140.

FIG. 11 is an assembled perspective view illustrating the upper elasticmember 150, the lower elastic member 160, the first position sensor 170,the sensor board 180, the base 210, the support members 220, and thecircuit board 250, which are illustrated in FIG. 2.

The upper elastic member 150 may include a plurality of upper elasticmembers 150; 150-1 to 150-4, which are conductively separated and spacedapart from one another.

The elastic member contact portions 184-1 to 184-4 of the sensor board180 may be conductively connected to at least one of the upper elasticmember 150 and the lower elastic member 160.

For example, although FIG. 11 illustrates that the elastic membercontact portions 184-1 to 184-4 come into electrical contact with theupper elastic members 150-1 to 150-4, the disclosure is not limitedthereto. In another embodiment, the elastic member contact portions184-1 to 184-4 may come into electrical contact with the lower elasticmember 160, or may come into electrical contact with both the upperelastic member 150 and the lower elastic member 160.

Each of the respective elastic member contact portions 184-1 to 184-4,which are conductively connected to the first position sensor 170, maybe conductively connected to a corresponding one of the upper elasticmembers 150-1 to 150-4. Each of the upper elastic members 150-1 to 150-4may be conductively connected to a corresponding one of the supportmembers 220-1 to 220-4.

Each one 150 a of the first and third upper elastic members 150-1 and150-3 may include a first inner frame 151, a first outer frame 152 a,and a first frame connector 153.

Each one 150 b of the second and fourth upper elastic members 150-2 and150-4 may include the first inner frame 151, a first outer frame 152 b,and the first frame connector 153.

The first inner frame 151 of the first to fourth upper elastic members150-1 to 150-4 may be coupled to a corresponding one of the bobbin 110and the elastic member contact portions 184-1 to 184-4.

As illustrated in FIG. 4, when the upper surface 112 a of the secondprotrusion 112 of the bobbin 110 is flat, the first inner frame 151 ofthe upper elastic member 150 may be placed on the upper surface 112 a ofthe second protrusion 112 of the bobbin 110, and may be secured theretousing an adhesive member.

The first outer frame 152 a and 152 b may be coupled to the housing 140,and may be connected to the support members 220. The first frameconnector 153 of each of the upper elastic members 150-1 to 150-4 mayconnect the first inner frame 151 to the first outer frame 152 a and 152b.

Although the first outer frame 152 b may be formed by bisecting thefirst outer frame 152 a, the disclosure is not limited thereto. Inanother embodiment, the first outer frame 152 a may be bisected so as tohave the same shape as the first outer frame 152 b.

The first frame connector 153 may be bent at least one time so as toform a predetermined pattern. Upward and/or downward movement of thebobbin 110 in the first direction parallel to the optical axis may beelastically supported via positional variation and fine deformation ofthe first frame connector 153.

The first outer frame 152 a or 152 b of the upper elastic member 150illustrated in FIG. 11 may be coupled and secured to the housing 140 bymeans of the first upper support protrusion 143 of the housing 140. Inthe embodiment, each of the first outer frames 152 a and 152 b may beformed with a second of second through-hole 157, which has a shape andposition corresponding to those of the first upper support protrusion143. Here, the first upper support protrusion 143 and the second ofsecond through-hole 157 may be fixed to each other via thermal fusion,or using an adhesive such as, for example, epoxy.

By virtue of conductive connections between the elastic member contactportions 184-1 to 184-4 of the sensor board 180 and the first to fourthupper elastic members 150-1 to 150-4, four pins P11 to P22 of the firstposition sensor 170 may be conductively connected to the first to fourthupper elastic members 150-1 to 150-4.

The respective first to fourth upper elastic members 150-1 to 150-4 maybe connected to the circuit board 250 via the support members 220-1 to220-4. That is, the first upper elastic members 150-1 may beconductively connected to the circuit board 250 via at least one of thefirst of first and second of first support members 220-1 a and 220-1 b,and the second upper elastic members 150-2 may be conductively connectedto the circuit board 250 via the second support members 220-2. The thirdupper elastic members 150-3 may be conductively connected to the circuitboard 250 via at least one of the first of third and second of thirdsupport members 220-3 a and 220-3 b, and the fourth upper elasticmembers 150-4 may be conductively connected to the circuit board 250 viathe fourth support members 220-4.

The first position sensor 170 may receive a drive signal, for example,first and second powers having different polarities, from the circuitboard 250 through two (for example, 150-1 and 150-2) of the first tofourth upper elastic members 150-1 to 150-4 and the support membersconnected to the upper elastic members (for example, 220-1 and 220-2).The first position sensor 170 may output an output signal thereof to thecircuit board 250 through the remaining two (for example, 150-3 and150-4) of the first to fourth upper elastic members 150-1 to 150-4 andthe support members connected to the upper elastic members (for example,220-3 and 220-4).

Meanwhile, the lower elastic member 160 may include first and secondlower elastic members 160-1 and 160-2, which are conductively separatedand spaced apart from each other. The first coil 120 may be connected tothe support members 220-5 and 220-6 through the first and second lowerelastic members 160-1 and 160-2.

Each of the first and second lower elastic members 160-1 and 160-2 mayinclude at least one second inner frame 161-1 or 161-2, at least onesecond outer frame 162-1 or 162-2, and at least one second frameconnector 163-1 or 163-2.

The second inner frames 161-1 and 161-2 may be coupled to the bobbin110, and the second outer frames 162-1 and 162-2 may be coupled to thehousing 140. The first of second frame connector 163-1 may connect thesecond inner frame 161-1 and the second outer frame 162-1 to each other,the second of second frame connector 163-2 may connect the second innerframe 161-2 and the second outer frame 162-2 to each other, and thethird of second frame connector 163-3 may connect the second inner frame161-2 and the second outer frame 162-2 to each other.

The first lower elastic member 160-1 may further include a first coilframe 164-1, and the second lower elastic member 160-2 may furtherinclude the second coil frame 164-2.

Referring to FIG. 11, each of the first and second coil frames 164-1 and164-2 of the lower elastic member 160 may be connected to acorresponding one of two ends of the first coil 120 via conductiveconnection members such as solder. The first and second lower elasticmembers 160-1 and 160-2 may receive drive signals, for example drivecurrent, from the circuit board 250, and may transfer the first andsecond powers having different polarities to the first coil 120.

Each of the first and second lower elastic members 160-1 and 160-2 mayfurther include a fourth of second frame connector 163-4. The fourth ofsecond frame connector 163-4 may connect the coil frame 164 to thesecond inner frame 161-2.

At least one of the first of second to fourth of second frame connectors163-1 to 163-4 may be bent once or more so as to define a predeterminedpattern. In Particular, by positional variation and fine deformation ofthe first of second and third of second frame connectors 163-1 and163-3, upward and/or downward movement of the bobbin 110 in the firstdirection, parallel to the optical axis, may be elastically supported.

In an embodiment, each of the first and second lower elastic members160-1 and 160-2 may further include a bent portion 165. The bent portion165 may be bent at the second of second frame connector 163-2 toward theupper elastic member 150 in the first direction.

The upper elastic member 160 may further include fifth and sixth upperelastic members 150-5 and 150-6. The first to sixth upper elasticmembers 150-1 to 150-6 may be conductively separated and spaced apartfrom one another.

Each of the fifth and sixth upper elastic members 150-5 and 150-6 mayinclude a connecting frame 154 and a outer frame 155.

The connecting frame 154 may be connected to the bent portion 165, andmay extend in the first direction. The outer frame 155 may be bent atthe connecting frame 154 in the direction perpendicular to the firstdirection, and may be coupled to the housing 155. The outer frame 155may be connected to the support member 220-5 and 220-6. In other words,the fifth upper elastic member 150-5 may be connected to the fifthsupport member 220-5, and the sixth upper elastic member 150-6 may beconnected to the sixth support member 220-6. Here, the bent portion 165of each of the first and second lower elastic members 160-1 and 160-2may be integrally formed with the connecting frame 154 of the fifth orsixth upper elastic member 150-5 or 150-6 and the outer frame 155. Eachof the first and second lower elastic members 160-1 and 160-2 and thefifth and sixth upper elastic members 150-5 and 150-6 may includeportions 165 and 154, which are bent in the first direction.

The first and second lower elastic members 160-1 and 160-2 may receivepowers from the circuit board 250 via the fifth and sixth upper elasticmembers 150-5 and 150-6, which are connected to the support members220-5 and 220-6, and may transfer the powers to the first coil 120.Specifically, the first lower elastic member 160-1 may be connected tothe circuit board 250 via the sixth upper elastic member 150-6 and thesixth support member 220-6, and the second lower elastic member 160-2may be connected to the circuit board 250 via the fifth upper elasticmember 150-5 and the fifth support member 220-5.

Although each of the upper and lower elastic members 150 and 160 of theembodiment is divided into two or more parts, in another embodiment,each of the upper and lower elastic members 150 and 160 may not bedivided.

The second support protrusion 117 of the bobbin 110 may couple andsecure the second inner frame 161-1 or 161-2 of the lower elastic member160 to the bobbin 110. The second lower support protrusion 145 of thehousing 140 may couple and secure the second outer frame 162-1 or 162-2of the lower elastic member 160 to the housing 140.

Each of the second inner frames 161-1 and 161-2 of the first and secondlower elastic members 160-1 and 160-2 may be provided with a thirdthrough hole 161 a, which is formed at a position corresponding to thefirst lower support protrusion 117 of the bobbin 110 so as to have ashape corresponding to the first lower support protrusion 117 of thebobbin 110. Here, the first lower support protrusion 117 of the bobbin110 and the third through hole 161 a may be secured to each other viathermal fusion, or using an adhesive member such as epoxy.

Each of the second outer frames 162-1 and 162-2 of the first and secondlower elastic members 160-1 and 160-2 may be provided with a fourththrough hole 162 a at a position corresponding to the second lowersupport protrusion 145 of the housing 140. Here, the second lowersupport protrusion 145 of the housing 140 and the fourth through hole162 a may be secured to each other via thermal fusion, or using anadhesive member such as epoxy.

Although each of the upper elastic member 150 and the lower elasticmember 160 may be constituted by a leaf spring, the disclosure is notrestricted as to the material used for the upper and lower elasticmembers 150 and 160.

The power may be supplied to the first position sensor 170 via two upperelastic members (for example, 150-1 and 150-2), which are conductivelyseparated from each other, signals output from the first position sensor170 may be transferred to the circuit board 250 via the other two upperelastic members (for example, 150-3 and 150-4), which are conductivelyseparated from each other, and power may be supplied to the first coil120 via two lower elastic members 160-1 and 160-2, which areconductively separated from each other. However, the disclosure is notlimited thereto.

In another embodiment, the role of the upper elastic members 150-1 to150-4 and the role of the lower elastic members 160-1 and 160-2 may beexchanged. Specifically, in still another embodiment, the lower elasticmembers may include four lower elastic members, which are conductivelyseparated from each other. Here, power may be supplied to the first coil120 via two upper elastic members, power may be supplied to the firstposition sensor 170 via two lower elastic members, and signals outputfrom the first position sensor 170 may be transferred to the circuitboard 250 via the other two lower elastic members, which areconductively separated from each other. Although this arrangement is notillustrated in the drawings, it will be apparent from the drawings.

In order to suppress the vibration or oscillation of the bobbin 110caused by shocks or vibrations, a damper may be disposed in at least oneof the space between the upper elastic member 150 and the bobbin, thespace between the upper elastic member 150 and the housing 140, a spacebetween the lower elastic member 160 and the bobbin 110 and the spacebetween the lower elastic member 160 and the housing 140. The damper maycomposed of a sol or gel-type material, for example, epoxy.

Next, the support members 220 will be described.

The plurality of support members 220-1 to 220-6 may be disposed atrespective second side portions 142. For example, two support membersmay be disposed at each of the four second side portions 142.

In another embodiment, only one support member may be disposed at eachof two side portions 142 among the four second side portions 142 of thehousing 140, and two support members may be disposed at each of theother two side portions 142.

In a further embodiment, the support members 220 may be disposed in theform of a leaf spring at the first side portions of the housing 140.

As described above, the support members 220 may form paths through whichthe power required by the first position sensor 170 and the first coil120 is transferred, and may form paths through which signals output fromthe first position sensor 170 are supplied to the circuit board 250.

The support members 220 may be embodied as members for elastic support,for example leaf springs, coil springs, suspension wires or the like. Inanother embodiment, the support members 220 may be integrally formedwith the upper elastic member.

Next, the base 210, the circuit board 250, and the second coil 230 willbe described.

The base 210 may have a bore corresponding to the bore of the bobbin 110and/or the bore of the housing 140, and may have a shape thatcorresponds to that of the cover member 300, for example, a squareshape.

FIG. 12 is an exploded perspective view of the base 210, the second coil230, and the circuit board 250, which are illustrated in FIG. 1.

The base 210 may have a stepped portion 211, to which an adhesive may beapplied when the cover member 300 is secured to the base 210 using theadhesive. Here, the stepped portion 211 may guide the cover member 300coupled to the upper side thereof, and may be coupled to the end of thecover member 300 in a surface-contact manner.

The stepped portion 211 of the base 210 and the end of the cover member300 may be attached or secured to each other using, for example, anadhesive.

The base 210 may be provided with a support portion 255 having acorresponding size on the surface thereof facing the terminal 251 of thecircuit board 250. The support portion 255 of the base 210 may be formedon the outer side surface of the base 210, which does not have thestepped portion 211, and may support a terminal rib 253 of the circuitboard 250.

A second recess 212 may be formed in each corner of the base 210. Whenthe cover member 300 has a protrusion formed at each corner thereof, theprotrusion of the cover member 300 may be fitted into the second recess212 in the base 210.

In addition, seating recesses 215-1 and 215-2 may be formed in the uppersurface of the base 210 so that the second position sensor 240 may bedisposed in each of the seating recesses 215-1 and 215-2. In anembodiment, the base 210 may be provided with two seating recesses 215-1and 215-2, in which the second position sensors 240 may be disposed, soas to detect the extent to which the housing 140 moves in the second andthird directions. For example, although an angle defined between theimaginary lines, which are connected from the centers of the seatingrecesses 215-1 and 215-2 to the center of the base 1210, may be an angleof 90°, the disclosure is not limited thereto.

The seating recesses 215-1 and 215-2 in the base 210 may be disposed ator near the centers of the respective second coils 230, or the centersof the second coils 230 may coincide with the centers of the secondposition sensors 240.

The second coil 230 may be disposed above the circuit board 250, and thesecond position sensor 240 may be disposed under the circuit board 250.The second position sensor 240 may detect displacement of the housing140 relative to the base 210 in directions (the X-axis or y-axisdirection) perpendicular to the optical axis (that is, the z-axis).

The second position sensor 240 may include two sensors 240 a and 240 b,which are disposed at the base 210 so as to detect displacement of thehousing 140 in the direction perpendicular to the optical axis.

The circuit board 250 may be disposed on the upper surface of the base210, and may have a bore corresponding to the bore of the bobbin 110,the bore of the housing 140 and/or the bore of the base 210. The outercircumferential surface of the circuit board 250 may have a shape thatcoincides with or corresponds to the upper surface of the base 210, forexample, a square shape.

The circuit board 250 may include at least one terminal rib 253, whichis bent at the upper surface thereof and is provided with a plurality ofterminals or pins 251, which receive electrical signals from theoutside.

In FIG. 12, the second coil 230 is implemented as being provided on thecircuit member 231, which is separate from the circuit board 250,without being limited thereto. In another embodiment, the second coil230 may take the form of a ring-shaped coil block, an FP coil, or acircuit pattern formed on the circuit board 250.

The second coil 230 may have through-holes 230 a formed in the circuitmember 231. The support members 220 may extend through the through-holes230 a so as to be conductively connected to the circuit board 250.

The second coil 230 is located above the circuit board 250 so as to beopposite the first magnet 130 secured to the housing 140.

Although four second coils 230 may be installed on four sides of thecircuit board 250, the disclosure is not limited thereto, and only twosecond coils may be installed respectively in the second direction andthe third direction, or four or more second coils may be installed.

The housing 140 may move in the second direction and/or the thirddirection via interaction of the first magnet 130 and the second coil230, which are arranged to be opposite each other as described above,thereby performing handshake correction.

The second position sensor 240 may be embodied as a Hall sensor, or anyother sensor may be used as long as it can detect the strength of amagnetic field. For example, the second position sensor 240 may take theform of a driver that includes a Hall sensor, or may be embodied as aposition detection sensor alone, such as, for example, a Hall sensor.

A plurality of terminals 251 may be installed on the terminal rib 253 ofthe circuit board 250. For example, the circuit board 250 may receiveexternal powers through the plurality of terminals 251 installed on theterminal rib 253, and may supply the powers to the first and secondcoils 120 and 230 and the first and second position sensors 170 and 240.The circuit board 250 may outward1y output signals received from thefirst and second position sensors 170 and 240.

In the embodiment, although the circuit board 250 may be embodied as aFlexible Printed Circuit Board (FPCB), the disclosure is not limitedthereto. The terminals 251 of the circuit board 250 may be direct1yformed on the surface of the base 210 via, for example, a surfaceelectrode process.

The circuit board 250 may have through holes 250 a 1 and 250 a 2 throughwhich the support members 220 extend. The support members 220 may beconductively connected to the respective circuit patterns formed on thebottom surface of the circuit board 250 via soldering or the like. Inanother embodiment, the circuit board 250 may not have the through holes150 a 1 and 250 a 2, and the support members 220 may be conductivelyconnected to the respective circuit patterns formed on the upper surfaceof the circuit board 250 via soldering or the like.

The circuit board 250 may further have a through hole 250 b, which iscoupled to an upper support protrusion 217 of the base 210. The uppersupport protrusion 217 of the base 210 and the through hole 250 b of thecircuit board 250 may be coupled to each other, as illustrated in FIG.11, and may be secured to each other via an adhesive member such asepoxy.

FIG. 13 illustrates the output of an auto-focusing position sensoraccording to movement of the movable unit.

The horizontal axis (x-axis) represents the distance that the movableunit moves, and the vertical axis (y-axis) represents the output of theauto-focusing position sensor. The unit of the horizontal axis may bemm, and the unit of the vertical axis may be mV.

G1 indicates the output of the auto-focusing position sensor when thereis only the driving magnet, without the detection magnet, and G2indicates the output of the auto-focusing position sensor when both thedriving magnet and the detection magnet, spaced apart from the drivingmagnet, are present. In the case of G2, the distance between the drivingmagnet and the detection magnet may be 0.03 mm.

Referring to FIG. 13, it will be noted that the linearity of output ofthe auto-focusing position sensor relative to the moving distance of themovable unit is not good owing to magnetic flux saturation at the upperportion of the G1 curve. Meanwhile, it is noted that the G2 curve hasgood linearity in a wide range because the distance between thedetection magnet and the driving magnet is constant and theauto-focusing sensor is disposed in the space therebetween.

FIG. 14 illustrates variation in output of the auto-focusing sensoraccording to ambient temperature.

In FIG. 14, the horizontal axis represents the intensity of a magneticfield, the magnitude of current or the amount of displacement, and thevertical axis represents the output of the auto-focusing positionsensor. For example, in the x-y coordinates system, in which the origin(0, 0) is used as the reference point, the x-axis represents theintensity of a magnetic field, and the y-axis represents the output ofthe auto-focusing position sensor. Here, the reference point 15 may bethe point at which the output of the auto-focusing position sensor iszero. For example, the ambient temperature may be the temperature, towhich the position sensor is subjected due to the heat generated whileusing a cellular phone or a camera module.

In the drawing, f1 indicates the output of the auto-focusing positionsensor when the ambient temperature is 25° C., and f2 indicates theoutput of the auto-focusing position sensor when the ambient temperatureis 65° C.

Referring to FIG. 14, the output of the auto-focusing position sensor isproportional to the intensity of a magnetic field, and is lowered withincrease in the ambient temperature. For example, under the conditionsof a magnetic flux of 50 mT, an input current of the auto-focusingposition sensor of 5 [mA] and an ambient temperature of 25° C.˜125° C.,the reduction rate of the output of the auto-focusing position sensormay be −0.06%/° C.

As illustrated in FIG. 14, it is noted that an the slope of the graphrepresenting the output of the auto-focusing position sensor accordingto the intensity of a magnetic field is lowered with an increase in theambient temperature. For example, when the ambient temperature is higherthan 25° C. but lower than 65° C., the graph representing the output ofthe auto-focusing position sensor according to the intensity of amagnetic field may have a slope that is higher than that of f2 but lowerthan that of f1.

Since the output of the auto-focusing position sensor varies accordingto variation in the ambient temperature, the lens mounted on the lensmoving apparatus may be defocused when auto-focusing feedback driving isperformed. For example, owing to the auto-focusing feedback driving, thelens mounted on the lens moving apparatus may have a first focal pointat 25° C. but may have a second focal point different from the firstfocal point at 65° C. The reason for this is because the output of theauto-focusing sensor at 65° C. is lower than the output of theauto-focusing position sensor at 25° C. and the lens mounted on the lensmoving apparatus is displaced by the auto-focusing feedback drivingbased on the lowered output of the auto-focusing position sensor.

The focal length of the lens mounted on the lens moving apparatus aswell as the output of the auto-focusing position sensor are affected byvariation in the ambient temperature. For example, when the temperatureof the movable unit or the ambient temperature increases, the lensmounted on the lens moving apparatus may expand, and the focal length ofthe lens may thus be increased.

By considering both variation in the output of the auto-focusing sensoraccording to variation in the ambient temperature and variation in thefocal length of the lens according to variation in the ambienttemperature, it is possible to suppress defocusing of the lens due tothe variation in the ambient temperature.

For example, by automatically controlling variation of output of theauto-focusing position sensor so as to compensate for a change in thefocal length of the lens caused by variation in the ambient temperature,it is possible to suppress defocusing of the lens mounted on the lensmoving apparatus due to the variation in the ambient temperature.

The lens moving apparatus may be provided with a first lens, whichincreases in focal length with an increase in the ambient temperature.When the first lens is mounted on the lens moving apparatus, the firstarea within the first quadrant in the x-y coordinates plane shown inFIG. 14 may be selected as the area in which the voice coil motor (VCM)is used. Here, the first quadrant may be an area in which both the xcoordinate and the y coordinate are positive, and the third quadrant maybe an area in which both the x coordinate and the y coordinate arenegative. In other words, the output range of the auto-focusing positionsensor for auto-focusing feedback driving is controlled within the firstarea 11.

The reason why the first quadrant 11 is selected as the area, in whichthe voice coil motor (VCM) is used, is as follows.

First, because the output of the auto-focusing position sensor in thefirst quadrant and the output of the auto-focusing position sensor inthe third quadrant move in opposite directions according to variation inthe ambient temperature, the accuracy and reliability of auto-focusingdriving may be lowered if both the first and third quadrants are used asthe control area of auto-focusing driving.

Second, by virtue of first and second causes, the focus of the firstlens mounted on the lens moving apparatus is automatically correctedupon auto-focusing feedback driving. Here, the first cause is thedisplacement of the first lens resulting from auto-focusing feedbackdriving due to a decrease in the output of the auto-focusing positionsensor in the first quadrant as a result of an increase in the ambienttemperature. The second cause is the increase in focal length of thefirst lens due to increase in the ambient temperature.

The first area 11 may include neither the origin (0,0) nor coordinateson the x-axis and y-axis defining the first quadrant. This is tocompensate for variation in the focal length of the first lens due tothe second cause.

However, when only the first area 11 in the first quadrant is selectedas the area in which the voice coil motor (VCM) is used, the linearsection in the intensity of a magnetic field detected by theauto-focusing position sensor may be shortened, and calibration for theauto-focusing feedback driving may not be easy. For example, thecalibration may be a series of procedures or processes that areperformed in order to amplify the output of the position sensor so as toadjust the output to the voltage range used in a device to which thelens moving apparatus is mounted.

For example, the output level of the first position sensor 170 is lowerthan the grayscale voltage corresponding to the digital code forcontrolling the current of the first coil 120. Accordingly, in order toreflect the output of the first position sensor 170 to the digital codefor controlling the auto-focusing feedback control of controlling thecurrent of the first coil 120, the output of the first position sensor170 has to be amplified to within the range of grayscale voltage.However, when the output range of the first position sensor 170 islimited to the first area 11, the calibration process employing theamplification of output may be complicated.

When a second lens which has the focal length that decreases with anincrease in the ambient temperature is mounted, the lens movingapparatus may select an area in the third quadrant of the x-ycoordinates as the area in which the voice coil motor (VCM) is used.

In order to facilitate the calibration process, the embodiment moves thecross point 15 shown in FIG. 14 to a first cross point 15 a shown inFIG. 15 or a second cross point 15 b shown in FIG. 20 and expands theoutput range of the first position sensor 170 for auto-focusing feedbackdriving as illustrated in FIGS. 15 and 20.

FIG. 15 illustrates an example of variation in the output of the firstposition sensor 170 mounted on the housing 140 and the bobbin 110 due tovariation in the ambient temperature.

In FIG. 15, the horizontal axis represents the intensity of a magneticfield, the magnitude of current applied to the first coil 120 or theamount of displacement, and the vertical axis represents the output ofthe first position sensor 170. For example, in the x-y coordinatessystem in which the origin (0, 0) is used as the reference point, thex-axis represents the intensity of a magnetic field, and the y-axisrepresents the output of the first position sensor 170.

The first graph (f1) indicates the output of the first position sensor170 over the intensity of a magnetic field detected by the firstposition sensor 170 when then ambient temperature is a firsttemperature, and the second graph (f2′) indicates the output of thefirst position sensor 170 over the intensity of a magnetic fielddetected by the first position sensor 170 when the ambient temperatureis a second temperature. The first temperature may range from 15° C. to25° C., and the second temperature may be higher than 25° C. but lowerthan 65° C. For example, in FIG. 15, the first temperature may be 15°C., and the second temperature may be 65° C.

The reference point (0,0) may be the point at which the output of thefirst position sensor 170 is zero. For example, the output of the firstposition sensor 170 over the intensity of a magnetic field may belinear, and the slopes of the first graph (f1) and the second graph (f2)may be constant.

Referring to FIG. 15, in order to facilitate the calibration forauto-focusing feedback driving, the first cross point 15 a between thefirst graph (f1) and the second graph (f2′) may be located in the thirdquadrant, and the output of the first position sensor 170 forauto-focusing feedback driving may be controlled to be within the firstarea 13.

For example, the output range of the first position sensor 170 in thestroke range in which the bobbin 110 is movable may fall within thefirst area 13. Although the first area 13 may be an area including avalue that is equal to or higher than a first reference value, thedisclosure is not limited thereto. For example, the first referencevalue may be the output of the first position sensor 170 at the firstcross point 15 a.

For example, the first area 13 in FIG. 15 may include the first crosspoint 15 a, may be equal to or higher than the first reference value,and may be an area spanning between the first quadrant and the thirdquadrant.

Generally, although the calibration is changed according to thecharacteristic amount of amplification by the driver performingcalibration process, the calibration may be controlled by controllingthe offset and the amount of amplification by the driver. Because theoffset of the driver may increase with an increase in the amount ofamplification by the driver, the result obtained from amplification ofthe output of the position sensor according to the set amount ofamplification has to fall within the voltage range used in the device towhich the lens moving apparatus is mounted.

In FIG. 14, the cross point 15 between f1 and f2 is the origin (0,0),and the first area 11 is located in the first quadrant. Meanwhile, inFIG. 15, in order to facilitate the calibration for auto-focusingfeedback driving, the first cross point 15 a between f1 and f2′ may belocated in the third quadrant, the first area 13 has a lower limit valueat the first cross point 15 a, which is located in the third quadrant,and the upper limit value, which is located in the first quadrant.

The location of the first cross point 15 a in the third quadrant may bedetermined by an ambient temperature and the extent of expansion of thehousing 140 due to variation in temperature. For example, as an ambienttemperature and the extent of expansion of the housing 140 due tovariation in temperature increase, the first cross point 15 a may becomedistant from the origin (0,0).

For example, when the bias driving current of the first position sensor1700 is 1 [mA], the output of the first position sensor 170 at the firstcross point 15 a may be lower than −10 mV.

The output range of the first position sensor 170, which corresponds tothe stroke range of the auto-focusing movable unit, may be within thefirst area 13.

In the entire first area 13 of FIG. 15, the output of the first positionsensor 170 may be lowered as the ambient temperature increases, giventhe same intensity of a magnetic field.

Even if the graph representing the output of the first position sensor170 over variation in temperature is as illustrated in FIG. 15, it issufficient for the range of output values of the first position sensor170 for actual auto-focusing feedback driving to fall within the firstarea 13. The first area 13 may be represented as the output of theposition sensor relative to the entire stroke of the movable unit (forexample, the bobbin 110) upon auto-focusing driving.

For example, the range of the output values of the first position sensor170 for auto-focusing feedback driving may be the same as the first area13. The range of the output values of the first position sensor 170 forauto-focusing feedback driving may include the output value at the firstcross point 15 a.

Although the output value of the auto-focusing position sensorillustrated in FIG. 14 has only a positive value, the output value ofthe first position sensor 170 may have both positive and negativevalues, and the positive output value of the first position sensor 170may be greater than the absolute value of the negative output valuethereof. The range of output values of the first position sensor 170 forauto-focusing feedback driving may be from the lower limit value of thefirst cross point 15 a to the upper limit value in the first quadrant.For example, the first cross point 15 a may be located to be spacedapart from the origin (0,0), the x-axis and the y-axis.

In another embodiment, the range of output values of the first positionsensor 170 in the stroke range in which the bobbin 110 is movable maynot include the first cross point 15 a. For example, the range of outputvalues of the first position sensor 170 in the stroke range in which thebobbin 110 is movable may fall within the first area. Here, the firstarea may include a range larger than the range of the output of thefirst position sensor 170 at the first cross point 15 a.

In another embodiment, the range of output values of the first positionsensor 170 in the stroke range in which the bobbin 110 is movable may bea portion of the first area 13 in the first quadrant.

The reason for this is because it is impossible to sufficient1ycompensate for variation in the focal length of the first lens caused byvariation in temperature because deviation in the output value of thefirst position sensor 170 due to variation in temperature is small inthe vicinity of the first cross point 15 a of FIG. 15. Accordingly, itis possible to sufficient1y compensate for variation in the focal lengthof the first lens caused by variation in temperature by setting aportion of the first area 13 in the first quadrant, in which deviationin the output value of the first sensor 170 caused by variation intemperature is increased, to be the range of the output of the firstposition sensor 170 in the stroke range in which the bobbin 110 ismovable.

When the range of output values of the first position sensor 170 forauto-focusing feedback driving does not include the first cross point 15a, the first cross point 15 a may be the cross point between theextended lines of the graphs representing the output of the firstposition sensor 170 according to variation in temperature.

The reason why the area, in which the voice coil motor (VCM) is used,falls within the first area 13 of FIG. 15 is to make it easy to performthe two tasks described in FIG. 14 and the calibration for auto-focusingfeedback driving.

In order to cause the range of the output of the first position sensor170 for auto-focusing feedback driving to fall within the first area 13,the embodiment may have a structure in which the first magnets 130 andthe second magnet 190 are spaced apart from the housing 140, the firstposition sensor 170 is disposed in a space between the first magnet 130for driving and the second magnet 190 for detection and the distancebetween the second magnet 190 and the first position sensor 170 and thedistance between the first and second magnets 130 and 190 are changedaccording to variation in the ambient temperature.

The first position sensor 170 may detect the sum of the intensity of amagnetic field of the first magnets 130 and the intensity of a magneticfield of the second magnet 190.

FIG. 16 illustrates a first embodiment of the relative positionalrelationships among the first position sensor 170, the second magnet190, the first magnets 130 and the first coil 120.

Referring to FIG. 16, the first coil 120 may be disposed at the lowerside of the outer circumferential surface of the bobbin 110, and thefirst position sensor 170 may be disposed at the outer circumferentialsurface of the bobbin 110 above the first coil 120 so as to be spacedapart from the first coil 120.

The first magnet 130 may be mounted on the housing 140 so as to face thefirst coil 120.

The movable unit, for example, the first magnet 130 may be disposed soat to face or to be aligned with the first coil 120 in the directionperpendicular to the first direction when the bobbin 110 is located atthe initial position.

The first magnet 130 may be a monopole-magnetized magnet, which hasdifferent polarities at the inner and outer sides thereof. The boundaryplane between the S pole and the N pole of the first magnet 130 may beparallel to the direction in which the first magnet 130 and the firstcoil 120 face each other. For example, the boundary plane between the Spole and the N pole of the first magnet 130 may be oriented to beparallel to the first direction parallel to the optical axis.

For example, although the first magnet 130 may be disposed on thehousing 140 such that the surface thereof that faces the first coil 120is an S pole and the opposite surface thereof is an N pole, thedisclosure is not limited thereto, and the reverse disposition is alsopossible.

The second magnet 190 may be disposed or mounted on the housing 140 soas to be positioned above the first magnet 130. The second magnet 190may be a monopole-magnetized magnet, which has an N pole and an S pole.

The boundary plane between the S pole and the N pole of the secondmagnet 190 disposed on the housing 140 may be parallel to the boundaryplane between the S pole and the N pole of the first magnet 130, withoutbeing limited thereto. Although the second magnet 190 may be disposed onthe housing 140 the surface of the second magnet 190 that faces theouter circumferential surface of the bobbin 110 is an N pole and theopposite surface thereof is an S pole, the disclosure is not limitedthereto.

Although the second magnet 190 may have a smaller size than the firstmagnet 130, the disclosure is not limited thereto.

The second magnet 190 may be disposed at the upper side of the firstmagnet 130 so as to be spaced apart from the first magnet 130. Forexample, the second magnet 190 may at least partially overlap the firstmagnet 130 in the first direction, without being limited thereto.

For example, the housing 140 may include an inner circumferentialsurface 22, an outer circumferential surface 21 positioned opposite theinner circumferential surface 22, an upper surface 23, and a lowersurface 23.

A first portion Q1 of the housing 140 may be positioned between thesecond magnet 190 and the inner circumferential surface 22 of thehousing 140. The upper portion of the second magnet 190 may be exposedfrom the upper surface 23 of the housing 140, and one side surface ofthe second magnet 190 may be exposed from the outer circumferentialsurface 21 of the housing 140. For example, the outer circumferentialsurface 21 of the housing 140 may be the outer circumferential surfaceof the first side portion 141 of the housing 140.

For example, the upper ends of the N pole and the S pole of the secondmagnet 190 may be exposed from the upper surface 23 of the housing 140,and one side surface of the S pole of the second magnet 190 may beexposed from the outer circumferential surface 21 of the housing 140.

The first magnet seat 141 b may be provided in the upper end of thehousing 140 so as to have a recessed shape including a bottom surfaceand a side surface, and may have a first opening, which is open at theupper surface 230 of the housing 140, and a second opening, which isopen at the outer circumferential surface 21 of the housing 140.

The first portion Q1 of the housing 140 may be disposed between thesecond magnet 190 mounted on the housing 140 and the innercircumferential surface 22 of the housing 140. For example, the firstportion Q1 of the housing 140 may be disposed between the first magnetseat 141 b and the inner circumferential surface 22 of the housing 140.

When the bobbin 110 is located at the initial position, the firstposition sensor 170 may be disposed on the outer circumferential surfaceof the bobbin 110 so as to be positioned in or aligned with the spacebetween the first magnet 130 and the second magnet 190 in the firstdirection.

For example, the movable unit of the lens moving apparatus may move fromthe initial position in the +z-axis direction or the —z-axis directiondue to electromagnetic interaction between the first coil 120 and thefirst magnet 130.

The movable unit may be an auto-focusing movable unit. The auto-focusingmovable unit may include the bobbin 110 and components that are mountedon the bobbin 110 and are moved therewith. For example, theauto-focusing movable unit may include at least the bobbin 110 and alens (not shown) mounted on the bobbin 110. In some embodiments, themovable unit may further include at least one of the first coil 120 andthe first position sensor 170.

The initial position may be the initial position of the movable unitwhen no power is applied to the first coil 120, or may be the positionat which the movable unit is disposed when the upper and lower elasticmembers 150 and 160 are elastically deformed by only the weight of themovable unit. At the initial position, the movable unit, for example thebobbin 110, may be spaced apart from the stationary unit, for examplethe housing 140, by means of the upper and lower elastic members 150 and160.

For example, at the initial position, the first position sensor 170 maynot overlap the second magnet 190 or the first magnet 130 in thedirection perpendicular to the first direction, without being limitedthereto.

In another embodiment, the first position sensor 170 in the initialposition may partially overlap the second magnet 190 or the first magnet130 in a direction perpendicular to the first direction.

The detecting portion 170 s (Hall element) of the first position sensor170 may be positioned so as to face the outer circumferential surface ofthe bobbin 110. For example, the detecting portion 170 s of the firstposition sensor 170 may be disposed so as to detect the intensity of amagnetic field in which the line of magnetic force is directed from theinner circumferential surface toward the outer circumferential surfaceof the bobbin 110.

For example, at the initial position, the detecting portion 170 s of thefirst position sensor 170 may be disposed on the outer circumferentialsurface of the bobbin 110 so as to be positioned in or aligned with thespace between the first magnet 130 and the second magnet 190 in thefirst direction.

For example, at the initial position, the detecting portion 170 s of thefirst position sensor 170 may not overlap the second magnet 190 or thefirst magnet 130 in the direction perpendicular to the first direction.

As illustrated in FIG. 16, an adhesive member 195 may be disposedbetween the second magnet 190 and the housing 140 so as to secure thesecond magnet 190 to the housing 140 via the adhesive member 195. Forexample, the adhesive member 195 may be disposed between the secondmagnet 190 and the first magnet seat 141 b. For example, the adhesivemember 195 may be disposed between the side surface and the bottomsurface of the first magnet seat 141 b and the magnet 190.

In FIG. 16, when the ambient temperature is a first temperature (forexample, 25° C.), the thickness of the adhesive member 195 may be t1,and the thickness of the first portion Q1 of the housing 140 may be t2.The distance between one end of the second magnet 190 and one end of thefirst position sensor 170 may be d1.

FIG. 17 illustrates the relative positional relationships among thefirst position sensor 170, the second magnet 190, the first magnets 130and the first coil 120, which are shown in FIG. 16, according tovariation in the ambient temperature.

Referring to FIG. 17, when an ambient temperature is a secondtemperature (for example, 65° C.), the adhesive member 195 and thehousing 140 may expand. Specifically, when an ambient temperatureincreases to a second temperature (for example, 65° C.), the thicknessof the adhesive member 195 may be t1′ (>t1), the thickness of the firstportion Q1′ of the housing 140 may be t2′ (>t2) and the distance betweenthe one end of the second magnet 190 and the one end of the firstposition sensor 170 may be d2 (>d1). For example, when the ambienttemperature increases from 25° C., the extent of expansion of thehousing 140 may be 5 82 m-10 μm.

As the ambient temperature increases, the distance between the secondmagnet 190 and the first position sensor 170 and the distance betweenthe second magnet 190 and the first magnet 130 increase. As a result,the embodiment has an effect of decreasing the output of the firstposition sensor 170. As illustrated in FIG. 15, there is an effect ofcausing the position of the first cross point 15 a to be moved into thethird quadrant.

FIG. 18 illustrates a second embodiment of the relative positionalrelationships among the first position sensor 170, the second magnet190, the first magnets 130 and the first coil 120. Reference numeralsthat are the same as those of FIG. 17 indicate the same components, anddescriptions regarding the same components are simplified or omitted.

Referring to FIG. 18, the second magnet 190 may be spaced apart fromboth the inner circumferential surface and the outer circumferentialsurface 21 of the housing 140.

The first portion Q11 of the housing 140 is positioned between thesecond magnet 190 and the inner circumferential surface 22 of thehousing 140, and the second portion Q2 of the housing 140 is positionedbetween the second magnet 190 and the outer circumferential surface 21of the housing 140.

Only the upper portion of the second magnet 190 may be exposed from theupper surface 23 of the housing 140.

For example, the upper end of the N pole and the upper end of the S poleof the second magnet 190 may be exposed from the upper surface 23 of thehousing 140.

The first magnet seat 141 b may include an opening that is open at theupper surface 23 of the housing 140, and may be provided in the uppersurface 23 of the housing 140 so as to be spaced apart from both theouter circumferential surface 21 and the inner circumferential surface22 of the housing 140.

The first portion Q11 of the housing 140 may be positioned between thefirst magnet seat 141 b and the inner circumferential surface 22 of thehousing 140, and the second portion Q2 of the housing 140 may bepositioned between the first magnet seat 141 b and the outercircumferential surface 21 of the housing 140.

The thickness t3 of the first portion Q11 of the housing 140 is greaterthan the thickness t4 of the second portion Q2 of the housing 140 (t3>t4).

Because the thickness t3 of the first portion Q11 of the housing 140 isgreater than the thickness t4 of the second portion Q2, the firstportion Q11 may expand more than the second portion Q23 as the ambienttemperature increases. Since the first portion Q1 expands more than thesecond portion Q2, the distance between the second magnet 190 and thefirst position sensor 170 may increase. Furthermore, as the ambienttemperature increases, the distance between the first magnet 130 and thesecond magnet 190 may increase. Consequent1y, the embodiment may haveeffects of decreasing the output of the first position sensor 170 and ofcausing the position of the first cross point 15 a to be moved into thethird quadrant as illustrated in FIG. 15.

FIG. 19 illustrates a third embodiment of the relative positionalrelationships among the first position sensor 170, the second magnet190, the first magnets 130 and the first coil 120. Reference numeralsthat are the same as those of FIG. 17 indicate the same components, anddescriptions regarding the same components are simplified or omitted.

Referring to FIG. 19, the first portion Q12 of the housing 140 ispositioned between the second magnet 190 and the inner circumferentialsurface 22 of the housing 140, and the third portion Q3 of the housing140 is positioned between the second magnet 190 and the upper surface 23of the housing 140.

Only one side surface of the second magnet 190 may be exposed from theouter circumferential surface 21 of the housing 140.

For example, the S pole of the second magnet 190 may be exposed from theouter circumferential surface 21 of the housing 140.

The first magnet seat 141 b may be depressed from the outercircumferential surface 21 of the housing 140.

The first magnet seat 141 b may include an opening that is open at theouter circumferential surface 21 of the housing 140, and may be providedin the outer circumferential surface 21 of the housing 140 so as to bespaced apart from both the upper surface 23 and the innercircumferential surface 22 of the housing 140.

The third portion Q3 of the housing 140 may be positioned between thefirst magnet seat 141 b and the upper surface 23 of the housing 140, andthe first portion Q12 of the housing 140 may be positioned between thefirst magnet seat 141 b and the inner circumferential surface 22 of thehousing 140 and between the third portion Q3 and the innercircumferential surface 22 of the housing 140.

Although the thickness of the first portion Q12 of the housing 140 maybe greater than the thickness of the third portion Q3, the disclosure isnot limited thereto.

Because the first magnet seat 141 b is open at the outer circumferentialsurface 21 of the housing 140 and the first portion Q12 of the housing140 is present between the first magnet seat 141 b and the innercircumferential surface 22 of the housing 140, as the ambienttemperature increases, the first portion Q12 of the housing 140 mayexpand, and the distance between the second magnet 190 and the firstposition sensor 170 may increase. Furthermore, as the ambienttemperature increases, the distance between the first magnet 130 and thesecond magnet 190 may increase. Consequent1y, the embodiment may haveeffects of decreasing the output of the first position sensor 170 and ofcausing the position of the first cross point 15 a to be moved into thethird quadrant as illustrated in FIG. 15.

FIG. 20 illustrates another embodiment of variation of output of thefirst position sensor 170 mounted on the housing 140 according tovariation in the ambient temperature. The horizontal axis and thevertical axis are the same as those of FIG. 15. Here, f1 indicates theoutput of the first position sensor 170 at an ambient temperature of 25°C., and f2″ indicates the output of the first position sensor 170 at anambient temperature of 65° C.

FIG. 20 illustrates the area of use of the first position sensor 170 ofthe lens moving apparatus to which a second lens, which has a focallength that is decreased with an increase in the ambient temperature, ismounted.

Referring to FIG. 20, in order to facilitate the calibration forauto-focusing feedback driving, the second cross point 15 b between f1and f2″ may be located in the first quadrant, and the output value ofthe first position sensor 170 for auto-focusing feedback driving may beincluded in the second area 14.

The second area 14 of FIG. 20 may include the second cross point 15 b,and may be an area spanning between the first quadrant and the thirdquadrant.

The output of the first position sensor 170 shown in FIG. 20 may have apositive value or a negative value. For example, the absolute positivevalue of the output of the first position sensor 170 shown in FIG. 20may be less than the absolute value of a negative value.

In order to facilitate the calibration of auto-focusing feedbackdriving, the second cross point 15 b may be located in the thirdquadrant, and the second area 14 may have an upper limit value at thesecond cross point 15 b located in the first quadrant and a lower limitvalue located in the third quadrant.

For example, the second cross point 15 b may be located so as to bespaced apart from the origin (0,0), the x-axis and the y-axis.

The position of the second cross point 15 b in the first quadrant may bedetermined by the ambient temperature and the extent of expansion of thehousing 140 due to variation in temperature. For example, as the ambienttemperature and the extent of expansion of the housing 140 due tovariation in temperature increase, the second cross point 15 b maybecome distant from the origin (0,0).

The output of the first position sensor 170 in the entire second area 14of FIG. 20 may increase as the ambient temperature increases, given thesame intensity of a magnetic field.

The output range of the first position sensor 170 in the stroke range inwhich the bobbin 110 is movable may be included in the second area 14.Specifically, the output range of the first position sensor 170 of thelens moving apparatus according to the embodiment, to which a secondlens is mounted, may be included in the second area 14. For example, theoutput value of the first position sensor 170 may be controlled withinthe second area 14.

The reason for this is to enable the focus of the second lens mounted onthe lens moving apparatus to be automatically corrected uponauto-focusing feedback driving due to first and second causes. Here, thefirst cause is displacement of the second lens resulting fromauto-focusing feedback driving due to an increase in the output of theauto-focusing position sensor in the second area 14 in response to anincrease in the ambient temperature. The second cause is the decrease infocal length of the second lens due to an increase in the ambienttemperature.

Since the second cross point 15 b between f1 and f2″ is located in thefirst quadrant, it is possible to easily perform the calibration forauto-focusing feedback driving.

For example, the range of output values of the first position sensor 170for auto-focusing feedback driving may be the same as the second area14. The range of output values of the first position sensor 170 forauto-focusing feedback driving may include the output value at thesecond cross point 15 b.

The output value of the first position sensor 170 for auto-focusingfeedback driving may range from the upper limit value of the secondcross point 15 b to the lower limit value located in the third quadrant.For example, the second cross point 15 b may be located so as to bespaced apart from the origin (0,0), the x-axis and the y-axis.

Alternatively, the range of output values of the first position sensor170 for auto-focusing feedback driving may not include the second crosspoint 15 b. For example, the range of output values of the firstposition sensor 170 for auto-focusing driving may be the portion of thesecond area 14 located in the third quadrant.

The reason for this is because it is impossible to sufficient1ycompensate for variation in the focal length of the second lens causedby variation in temperature because deviation of the output value of thefirst position sensor 170 caused by variation in temperature is small inthe vicinity of the second cross point 15 b of FIG. 20. Accordingly, itis possible to sufficient1y compensate for variation in the focal lengthof the first lens caused by variation in temperature by setting aportion of the second area 14 in the first quadrant, in which deviationin the output value of the first sensor 170 caused by variation intemperature is increased, to fall within the range of the output of thefirst position sensor 170 for auto-focusing feedback driving.

When the range of output values of the first position sensor 170 doesnot include the second cross point 15 b, the second cross point 15 b maybe the cross point between the extended lines of the graphs representingthe output of the first position sensor 170 according to variation intemperature.

FIG. 21 illustrates a fourth embodiment of the relative positionalrelationships among the first position sensor 170, the second magnet190, the first magnets 130 and the first coil 120. Reference numeralsthat are the same as those of FIG. 16 indicate the same components, anddescriptions regarding the same components are simplified or omitted.

Referring to FIG. 21, a first portion R1 of the housing 140 may bepositioned between the second magnet 190 and the outer circumferentialsurface 21 of the housing 140. The upper portion of the second magnet190 may be exposed from the upper surface 23 of the housing 140, and oneside surface of the second magnet 190 may be exposed from the innercircumferential surface 22 of the housing 140.

For example, the upper end of the N pole and the upper end of the S poleof the second magnet 190 may be exposed from the upper surface 23 of thehousing 140, and one side surface of the N pole of the second magnet 190may be exposed from the inner circumferential surface 22 of the housing140.

The first magnet seat 141 b may be provided in the upper end of thehousing 140, and may include a first opening that is open at the uppersurface 23 of the housing 140 and a second opening that is open at theinner circumferential surface 22 of the housing 140.

The first portion R1 of the housing 140 may be positioned between thesecond magnet 190, mounted on the housing 140, and the outercircumferential surface 21 of the housing 140. For example, the firstportion R1 of the housing 140 may be positioned between the first magnetseat 141 b and the outer circumferential surface 21 of the housing 140.

As illustrated in FIG. 21, the adhesive member 195 may be positionedbetween the second magnet 190 and the first magnet seat 141 b so as tosecure the second magnet 190 to the housing 140.

In the embodiment shown in FIG. 21, when the ambient temperature is afirst temperature (for example, 25° C.), the thickness of the adhesivemember 195 may be t11, and the thickness of the first portion R1 of thehousing 140 may be t12. The distance between one end of the secondmagnet 190 and the first position sensor 170 may be d3.

FIG. 22 illustrates the relative positional relationships among thefirst position sensor 170, the second magnet 190, the first magnets 130and the first coil 120, which are shown in FIG. 21, according tovariation in temperature.

Referring to FIG. 22, when the ambient temperature is a secondtemperature (for example, 65° C.), the adhesive member 195 and thehousing 140 may expand. Accordingly, the thickness of the adhesivemember 195 may be t11′ (>t11), the thickness of the first portion R1′may be t12′ (>t12) and the distance between one end of the second magnet190 and the first position sensor 170 may be d4 (<d3).

As the ambient temperature increases, owing to expansion of the adhesivemember 195 and the housing 140, the distance between the second magnet190 and the first position sensor 170 may decrease, and the distancebetween the first and second magnets 130 and 190 may decrease.Consequent1y, the embodiment may have an effect of increasing the outputof the first position sensor 170. As illustrated in FIG. 20, there is aneffect of enabling the position of the second cross point 15 b to bemoved into the first quadrant.

FIG. 23 illustrates a fifth embodiment of the relative positionalrelationships among the first position sensor 170, the second magnet190, the first magnets 130 and the first coil 120. Reference numeralsthat are the same as those in FIG. 18 indicate the same components, anddescriptions regarding the same components are simplified or omitted.

Referring to FIG. 23, a first portion R11 of the housing 140 ispositioned between the second magnet 190 and the outer circumferentialsurface 21 of the housing 140, and a second portion R2 of the housing140 may be positioned between the second magnet 190 and the innercircumferential surface 22 of the housing 140.

Only the upper portion of the second magnet 190 may be exposed from theupper surface 23 of the housing 140.

For example, the upper end of the N pole and the upper end of the S poleof the second magnet 190 may be exposed from the upper surface 23 of thehousing 140.

The first magnet seat 141 b of FIG. 23 may include an opening that isopen at the upper surface 23 of the housing 140, and may be provided inthe upper surface 23 of the housing 140 so as to be spaced apart fromboth the outer circumferential surface 21 and the inner circumferentialsurface 22 of the housing 140.

The first portion R11 of the housing 140 may be positioned between thefirst magnet seat 141 b and the outer circumferential surface 21 of thehousing 140, and the second portion R2 of the housing 140 may bepositioned between the first magnet seat 141 b and the innercircumferential surface 21 of the housing 140.

The thickness of the first portion R11 of the housing 140 is greaterthan the thickness of the second portion R2 of the housing 140 (R11>R2). In FIG. 23, since the thickness of the first portion R11 of thehousing 140 is greater than the thickness of the second portion R2 ofthe housing 140, as the ambient temperature increases, the first portionR11 of the housing 140 may expand more than the second portion R2, andthe distance between the second magnet 190 and the first position sensor170 may decrease. Consequent1y, the embodiment may have effects ofincreasing the output of the first position sensor 170 and of causingthe position of the second cross point 15 b to be moved into the firstquadrant, as illustrated in FIG. 20.

FIG. 24 illustrates a sixth embodiment of the relative positionalrelationships among the first position sensor 170, the second magnet190, the first magnets 130 and the first coil 120. Reference numeralsthat are the same as those of FIG. 19 indicate the same components, anddescriptions regarding the same components are simplified or omitted.

Referring to FIG. 24, a first portion R12 of the housing 140 ispositioned between the second magnet 190 and the outer circumferentialsurface 21 of the housing 140, and a third portion R3 of the housing 140is positioned between the second magnet 190 and the upper surface 23 ofthe housing 140.

Only one side surface of the second magnet 190 may be exposed from theinner circumferential surface 22 of the housing 140.

For example, the N pole of the second magnet 190 may be exposed from theinner circumferential surface 22 of the housing 140.

The first magnet seat 141 b of FIG. 24 may include an opening that isopen at the inner circumferential surface 22 of the housing 140, and maybe provided in the inner circumferential surface 21 of the housing 140so as to be spaced apart from both the upper surface 23 and the outercircumferential surface 21 of the housing 140.

The third portion R3 of the housing 140 may be positioned between thefirst magnet seat 141 b and the upper surface 23 of the housing 140, andthe first portion R12 of the housing 140 may be positioned between thefirst magnet seat 141 b and the outer circumferential surface 21 of thehousing 140 and between the third portion R3 and the outercircumferential surface 21 of the housing 140.

Although the thickness of the first portion R12 of the housing 140 maybe greater than the thickness of the third portion R3 of the housing140, the disclosure is not limited thereto.

Since the first magnet seat 141 b of FIG. 24 is open at the innercircumferential surface 22 of the housing 140 and the first portion R12of the housing 140 is present between the first magnet seat 141 b andthe outer circumferential surface 21 of the housing 140, as the ambienttemperature increases, the first portion R12 of the housing 140 mayexpand, and the distance between the second magnet 190 and the firstposition sensor 170 may decrease. Consequent1y, the embodiment may haveeffects of increasing the output of the first position sensor 170 and ofcausing the position of the second cross point 15 b to be moved into thefirst quadrant as illustrated in FIG. 20.

FIG. 25 illustrates a seventh embodiment of the relative positionalrelationships among the first position sensor 170, the second magnet190, the first magnets 130 and the first coil 120.

Compared to the relative positional relationship shown in FIG. 16, thepositions of the first position sensor 170 and the second magnet 190 areexchanged with each other in FIG. 25. In other words, the second magnet190 may be disposed on the outer circumferential surface of the bobbin110, and may be secured to the bobbin 110 via the adhesive member 195.The upper side of the second magnet 190 disposed on the outercircumferential surface of the bobbin 110 may be the N pole, and thelower side thereof may be the S pole.

The first position sensor 170 may be disposed on the upper end of thehousing 140. The first portion Q1 of the housing 140 may be positionedbetween the first position sensor 170 and the inner circumferentialsurface 22 of the housing 140. The expansion of the housing 140according to variation in temperature, variation in the distance betweenthe first position sensor 170 and the second magnet 190, and variationin the output of the first position sensor 170 due to variation in thedistance and the displacement of the first cross point 15 a may be thesame as those described in FIGS. 15 to 17.

The position of the first position sensor 170 shown in FIG. 25 may bechanged into the position of the second magnet 190 shown in FIGS. 18 and19.

FIG. 26 illustrates an eighth embodiment of the relative positionalrelationships among the first position sensor 170, the second magnet190, the first magnets 130 and the first coil 120.

Compared to the relative positional relationships shown in FIG. 21, thepositions of the first position sensor 170 and the second magnet 190 areexchanged with each other in FIG. 26.

The first portion R1 of the housing 140 may be positioned between thefirst position sensor 170 and the outer circumferential surface 21 ofthe housing 140. Expansion of the housing 140 according to variation intemperature, variation in the distance between the first position sensor170 and the second magnet 190, and variation in the output of the firstposition sensor 170 due to the variation in the distance and thedisplacement of the first cross point 15 a may be the same as thosedescribed in connection with FIGS. 20 to 22.

The position of the first position sensor 170 shown in FIG. 26 may bechanged into the position of the second magnet 190 shown in FIGS. 23 and24.

The embodiment is able to suppress defocusing of the lens bycompensating for variation in the output of the first position sensor170 caused by variation in the ambient temperature and variation in thefocal length of the lens mounted on the lens moving apparatus.

Furthermore, the embodiment is able to easily perform calibration forauto-focusing feedback driving by moving the cross point between graphsrepresenting the output of the first position sensor according tovariation in temperature into the first quadrant from the origin of thex-y coordinates or into the third quadrant from the origin of the x-ycoordinates.

In addition, since the range of output values of the first positionsensor 170 used for auto-focusing feedback driving does not include thecross points 15 a and 15 b, the embodiment is able to sufficient1ycompensate for variation in the focal length of the lens caused byvariation in temperature.

Meanwhile, the lens moving apparatuses according to the above-describedembodiments may be used in various fields such as, for example, a cameramodule. The camera module may be applied to, for example, a mobileappliance such as a cellular phone or the like.

FIG. 27 is an exploded perspective view illustrating a camera module 200according to an embodiment.

Referring to FIG. 27, the camera module may include a lens barrel 400,the lens moving apparatus, an adhesive member 612, a filter 610, a firstholder 600, a second holder 800, an image sensor 810, a motion sensor820, a handshake controller 830, and a connector 840.

The lens barrel 400 may be mounted in the bobbin 110 of the lens movingapparatus.

The first holder 600 may be located under the base 210 of the lensmoving apparatus. The filter 610 may be mounted on the first holder 600,and the first holder 600 may have a raised portion 500 on which thefilter 610 is seated.

The adhesive member 612 may couple or attach the base 210 of the lensmoving apparatus to the first holder 600. In addition to the attachmentfunction described above, the adhesive member 612 may serve to inhibitcontaminants from entering the lens moving apparatus.

The adhesive member 612 may be, for example, epoxy, thermohardeningadhesive, or ultraviolet hardening adhesive.

The filter 610 may serve to inhibit light within a specific frequencyband, having passed through the lens barrel 400, from being introducedinto the image sensor 810. The filter 610 may be an infrared-lightblocking filter, without being limited thereto. Here, the filter 610 maybe oriented parallel to the X-Y plane.

The region of the first holder 600 in which the filter 610 is mountedmay be provided with a bore in order to allow the light that passesthrough the filter 610 to be introduced into the image sensor 810.

The second holder 800 may be disposed under the first holder 600, andthe image sensor 810 may be mounted on the second holder 800. The lightthat passes through the filter 610 is introduced into the image sensor810 so as to form an image on the image sensor 810.

The second holder 800 may include, for example, various circuits,devices, and a controller in order to convert the image, formed on theimage sensor 810, into electrical signals and to transmit the electricalsignals to an external component.

The second holder 800 may be embodied as a circuit board on which theimage sensor 810 may be mounted, a circuit pattern may be formed, andvarious devices may be coupled.

The image sensor 810 may receive an image contained in the lightintroduced through the lens moving apparatus, and may convert thereceived image into electrical signals.

The filter 610 and the image sensor 810 may be spaced apart from eachother so as to be opposite to each other in the first direction.

The motion sensor 820 may be mounted on the second holder 800, and maybe conductively connected to the handshake controller 830 through thecircuit pattern formed on the second holder 800.

The motion sensor 820 outputs rotational angular speed informationregarding the movement of the camera module 200. The motion sensor 820may be embodied as a dual-axis or triple-axis gyro sensor or an angularspeed sensor.

The handshake controller 830 may be mounted on the second holder 800,and may be conductively connected to the second position sensor 240 andthe second coil 230 of the lens moving apparatus. For example, thesecond holder 800 may be conductively connected to the circuit board 250of the lens moving apparatus, and the handshake controller 820 mountedon the second holder 800 may be conductively connected to the secondposition sensor 240 and the second coil 230 through the circuit board250.

The handshake controller 830 may output a drive signal, which isrequired to allow the OIS movable unit of the lens moving apparatus toperform handshake correction, based on feedback signals provided fromthe second position sensor 240 of the lens moving apparatus.

The connector 840 may be conductively connected to the second holder800, and may have a port for the electrical connection of an externalcomponent.

FIG. 28 is a perspective view illustrating a portable terminal 200Aaccording to an embodiment. FIG. 29 is a view illustrating theconfiguration of the portable terminal 200A illustrated in FIG. 28.

Referring to FIGS. 28 and 29, the portable terminal 200A (hereinafterreferred to as a “terminal”) may include a body 850, a wirelesscommunication unit 710, an audio/video (A/V) input unit 720, a sensingunit 740, an input/output unit 750, a memory unit 760, an interface unit770, a controller 780, and a power supply unit 790.

The body 850 illustrated in FIG. 28 has a bar shape, without beinglimited thereto, and may be any of various types such as, for example, aslide type, a folder type, a swing type, or a swivel type, in which twoor more sub-bodies are coupled so as to be movable relative to eachother.

The body 850 may include a case (e.g. casing, housing, or cover)defining the external appearance of the terminal. For example, the body850 may be divided into a front case 851 and a rear case 852. A varietyof electronic components of the terminal may be mounted in the spacedefined between the front case 851 and the rear case 852.

The wireless communication unit 710 may include one or more modules,which enable wireless communication between the terminal 200A and awireless communication system or between the terminal 200A and a networkin which the terminal 200A is located. For example, the wirelesscommunication unit 710 may include a broadcast receiving module 711, amobile communication module 712, a wireless Internet module 713, a nearfield communication module 714, and a location information module 715.

The A/V input unit 720 serves to input audio signals or video signals,and may include, for example, a camera 721 and a microphone 722.

The camera 721 may be the camera 200 including the camera module 200according to the embodiment illustrated in FIG. 27.

The sensing unit 740 may sense the current state of the terminal 200A,such as, for example, the opening or closing of the terminal 200A, thelocation of the terminal 200A, the presence of a user's touch, theorientation of the terminal 200A, or the acceleration/deceleration ofthe terminal 200A, and may generate a sensing signal to control theoperation of the terminal 200A. For example, when the terminal 200A is aslide-type phone, the sensing unit 740 may detect whether the slide-typephone is open or closed. In addition, the sensing unit 740 serves tosense, for example, whether power is supplied from the power supply unit790, or whether the interface unit 770 is coupled to an externalcomponent.

The input/output unit 750 serves to generate, for example, visual,audible, or tactile input or output. The input/output unit 750 maygenerate input data to control the operation of the terminal 200A, andmay display information processed in the terminal 200A.

The input/output unit 750 may include a keypad unit 730, a displaymodule 751, a sound output module 752, and a touchscreen panel 753. Thekeypad unit 730 may generate input data in response to input to akeypad.

The display module 751 may include a plurality of pixels, the color ofwhich varies in response to electrical signals. For example, the displaymodule 751 may include at least one of a liquid crystal display, a thinfilm transistor liquid crystal display, an organic light emitting diodedisplay, a flexible display and a 3D display.

The sound output module 752 may output audio data received from thewireless communication unit 710 in, for example, a call signal receivingmode, a call mode, a recording mode, a voice recognition mode, or abroadcast receiving mode, or may output audio data stored in the memoryunit 760.

The touchscreen panel 753 may convert variation in capacitance, causedby a user's touch on a specific region of a touchscreen, into electricalinput signals.

The memory unit 760 may store programs for the processing and control ofthe controller 780, and may temporarily store input/output data (e.g. aphone book, messages, audio, still images, pictures, and moving images).For example, the memory unit 760 may store images captured by the camera721, for example, pictures or moving images.

The interface unit 770 serves as a passage for connection between theterminal 200A and an external component. The interface unit 770 mayreceive power or data from the external component, and may transmit thesame to respective constituent elements inside the terminal 200A, or maytransmit data inside the terminal 200A to the external component. Forexample, the interface unit 770 may include, for example, awired/wireless headset port, an external charger port, a wired/wirelessdata port, a memory card port, a port for the connection of a devicehaving an identification module, an audio input/output (I/O) port, avideo I/O port, and an earphone port.

The controller 780 may control the general operation of the terminal200A. For example, the controller 780 may perform control and processingrelated to, for example, voice calls, data communication, and videocalls.

The controller 780 may include a multimedia module 781 for multimediaplayback. The multimedia module 781 may be provided inside thecontroller 780, or may be provided separately from the controller 780.

The controller 780 may perform pattern recognition processing, by whichwriting or drawing, input to a touchscreen is perceived as charactersand images respectively.

The power supply unit 790 may supply power required to operate therespective constituent elements upon receiving external power orinternal power under the control of the controller 780.

The features, configurations, effects and the like described above inthe embodiments are included in at least one embodiment, and but are notnecessary to be limited to only one embodiment. In addition, thefeatures, configuration, effects and the like exemplified in therespective embodiments may be combined with other embodiments ormodified by those skilled in the art. Accordingly, content related tothese combinations and modifications should be construed as fallingwithin the scope of the embodiments.

INDUSTRIAL APPLICABILITY

The embodiments may be applied to a lens moving device, a camera moduleand an optical device, which are capable of suppressing defocusing of alens caused by variation in the ambient temperature and of easilyperforming calibration for auto-focusing feedback driving.

1. A lens moving apparatus comprising: a housing; a bobbin disposed inthe housing; a first coil disposed on the bobbin; a magnet disposed onthe housing to be opposite to the first coil; a sensing magnet disposedon the housing; an upper elastic member coupled to an upper portion ofthe housing and an upper portion of the bobbin; and a first positionsensor disposed on the bobbin, wherein the housing comprises a firstportion disposed on an upper surface of the sensing magnet, and whereinthe upper surface of the sensing magnet is positioned lower than theupper elastic member.
 2. The lens moving apparatus according to claim 1,wherein the housing comprises a second portion disposed between a sidesurface of the sensing magnet and an outer circumferential surface ofthe housing.
 3. The lens moving apparatus according to claim 1, whereinthe housing comprises a magnet seat on which the sensing magnet isdisposed.
 4. The lens moving apparatus according to claim 3, wherein aportion of the sensing magnet is exposed from an inner circumferentialsurface of the housing.
 5. The lens moving apparatus according to claim2, wherein a length of the first portion of the housing in an opticalaxis direction is smaller than a length of the second portion of thehousing in a direction perpendicular to the optical axis direction. 6.The lens moving apparatus according to claim 1, comprising: a circuitmember disposed under the housing and comprising a second coil oppositeto the magnet; a circuit board disposed under the circuit member; and asupport member conductively connecting the upper elastic member and thecircuit board.
 7. The lens moving apparatus according to claim 6,wherein the upper elastic member comprises four elastic membersconductively connected to the first position sensor, and wherein thesupport member comprises four support members, and each of the foursupport members is coupled to a corresponding one of the four elasticmembers.
 8. The lens moving apparatus according to claim 3, comprisingan adhesive member disposed between the magnet seat and the sensingmagnet.
 9. The lens moving apparatus according to claim 1, wherein thefirst position sensor is electrically connected to the upper elasticmember.
 10. The lens moving apparatus according to claim 1, wherein themagnet comprises four magnet units disposed on four side portions of thehousing, respectively.
 11. The lens moving apparatus according to claim1, wherein the sensing magnet is disposed on a corner portion of thehousing.
 12. The lens moving apparatus according to claim 1, wherein thefirst position sensor is disposed above the first coil.
 13. The lensmoving apparatus according to claim 1, wherein the upper elastic membercomprises an inner frame coupled to the bobbin, an outer frame coupledto the housing, and a frame connector connecting the inner frame and theouter frame.
 14. The lens moving apparatus according to claim 13,wherein the upper surface of the sensing magnet is positioned lower thanthe outer frame of the upper elastic member.
 15. The lens movingapparatus according to claim 1, wherein the first position sensor is adriver including a Hall sensor.
 16. The lens moving apparatus accordingto claim 6, comprising: a base disposed under the circuit board; and asecond position sensor disposed between the base and circuit board andconductively connected to the circuit board, wherein the first positionsensor is configured to detect a movement of the bobbin and the secondposition sensor is configured to detect a movement of the housing. 17.The lens moving apparatus according to claim 1, comprising a lowerelastic member coupled to a lower portion of the bobbin and a lowerportion of the housing.
 18. A lens moving apparatus comprising: ahousing comprising a protrusion protruding from an upper surfacethereof; a bobbin disposed in the housing; a first coil disposed on thebobbin; a magnet disposed on the housing to be opposite to the firstcoil; a sensing magnet disposed on the housing; an upper elastic membercomprising an outer frame coupled to the protrusion of the housing, aninner frame coupled to an upper portion of the housing, and a connectionframe connecting the outer frame and the inner frame; and a firstposition sensor disposed on the bobbin, wherein the housing comprises afirst portion disposed on an upper surface of the sensing magnet, andwherein the upper surface of the sensing magnet is positioned lower thanthe protrusion of the housing.
 19. A lens moving apparatus comprising: ahousing; a bobbin disposed in the housing; a first coil disposed on thebobbin; a magnet disposed on the housing to be opposite to the firstcoil; a sensing magnet disposed on the housing; and a first positionsensor disposed on the bobbin.
 20. A camera module comprising: a lensbarrel; the lens moving apparatus according to claim 1; and an imagesensor.